Updated on 2023/04/07

写真a

 
HAYAKAWA Hisashi
 
Organization
Institute for Advanced Research Designated assistant professor
Institute for Space-Earth Environmental Research Designated assistant professor
Graduate School
Graduate School of Humanities
Title
Designated assistant professor
Profile
I am researching solar-terrestrial environments, space weather, and environmental history.

Degree 2

  1. PhD (Science) （ 2020.3   Kyoto University ） 

  2. PhD (Letters) （ 2020.3   Osaka University ） 

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Research Interests 7

  1. Solar-Terrestrial Environments

  2. Space Weather

  3. Environmental History

  4. Solar Physics

  5. Geomagnetism

  6. History of Science

  7. Oriental History

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Research Areas 7

  1. Natural Science / Astronomy  / Solar-Terrestrial Environments

  2. Natural Science / Human geosciences  / Space Weather

  3. Humanities & Social Sciences / Historical studies in general  / Environmental History

  4. Natural Science / Astronomy  / Solar Physics

  5. Natural Science / Human geosciences  / Geomagnetism

  6. Humanities & Social Sciences / Sociology of science, history of science and technology  / History of Science

  7. Humanities & Social Sciences / History of Asia and Africa  / Oriental History

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Research History 2

  1. Nagoya University   Institute for Advanced Research   Designated assistant professor

    2020.4

  2. Osaka University   Graduate School of Letters   JSPS Research Fellow

    2017.4 - 2020.3

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Education 1

  1. Osaka University   Graduate School of Letters

    2017.4 - 2020.3

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    Notes： PhD course

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Committee Memberships 4

  1. Journal of Astronomical History and Heritage   Editorial Board  

    2023.2   

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    Committee type：Academic society

  2. Asian Review of Wold Histories   Assistant Editor  

    2022.10 - 2024.8   

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    Committee type：Academic society

  3. Geoscience Data Journal   Guest Editor  

    2021.3 - 2022.1   

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    Committee type：Academic society

  4. History of Geo- and Space Science   Topical Editor  

    2019.9   

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    Committee type：Academic society

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Awards 2

  1. EPS Young Researcher Award

    2018.5   Earth Planets and Space  

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    Award type：Honored in official journal of a scientific society, scientific journal 

  2. Kyoto University Precident Prize

    2017.3   Kyoto University  

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Papers 51

  1. An Overview of Sunspot Observations in 1727-1748 Reviewed International coauthorship

    Hayakawa Hisashi, Hattori Kentaro, Soma Mitsuru, Iju Tomoya, Besser Bruno P., Kosaka Shunsuke

    ASTROPHYSICAL JOURNAL   Vol. 941 ( 2 ) page： 151 - 151   2022.12

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Astrophysical Journal  

    Solar activity generally exhibits cyclic behavior in terms of sunspot group number and sunspot positions every ≈11 yr. These sunspot data have therefore played key roles in numerous analyses of solar-terrestrial physics. However, their reconstructions prior to the 1830s have remained controversial and included significant data gaps, especially from the 1720s to the 1740s. Therefore, this study reviewed contemporary sunspot observations for 1727-1748 to add several forgotten records by Van Coesfelt in 1728-1729, Dûclos in 1736, Martin in 1737, and Cassini and Maraldi in 1748. On the basis of these records, this study revised the sunspot group number and newly derived the sunspot positions in this interval. The results show clearer solar cycles in sunspot group number than those of previous studies and indicate regular solar cycles with limited hemispheric asymmetry over Solar Cycles 0 to −2. The sunspot positions also show sunspot groups mostly at heliographic latitude φ fulfilling ∣φ∣ < 35° in both solar hemispheres, with slight equatorward motions. Furthermore, the solar minima between Solar Cycles −2 and −1 and between Solar Cycles −1 and 0 have been located around 1733.5 ± 0.5 and 1743 ± 0.5, indicating cycle lengths of 11.7 ± 0.5 yr and 10.0 ± 1.0 yr, respectively. Our results provide a chronological missing link between the Maunder Minimum and the regular solar cycles observed since Staudach’s observations from 1749 onward. This lets us better understand the transition of solar activity from the grand minimum to the regular solar cycles.

    DOI： 10.3847/1538-4357/ac6671

    Web of Science

    Scopus

  2. The extreme solar and geomagnetic storms on 1940 March 20-25 Reviewed International coauthorship

    Hayakawa Hisashi, Oliveira Denny M., Shea Margaret A., Smart Don F., Blake Sean P., Hattori Kentaro, Bhaskar Ankush T., Curto Juan J., Franco Daniel R., Ebihara Yusuke

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 517 ( 2 ) page： 1709 - 1723   2022.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Monthly Notices of the Royal Astronomical Society  

    In late 1940 March, at least five significant solar flares were reported. They likely launched interplanetary coronal mass ejections (ICMEs), and were associated with one of the largest storm sudden commencements (SSCs) since 1868, resulting in space weather hazards that would have significant societal impacts should it occur today. The initial solar activity is associated with a solar proton event. Afterwards, another flare was reported in the eastern solar quadrant (N12 E37-38) at 11:30-12:30 ut on March 23, with significant magnetic crochets (up to ≈ |80| nT at Eskdalemuir) during 11:07-11:40 ut. On their basis, we conservatively estimate the required energy flux of the source solar flare as X35 ± 1 in soft X-ray class. The resultant ICMEs caused enormous SSCs (up to >425 nT recorded at Tucson) and allowed us to estimate an extremely inward magnetopause position (estimated magnetopause stand-off position ≈3.4 RE). The time series of the resultant geomagnetic storm is reconstructed using a Dst estimate, which peaked at 20 ut on March 24 at ≈ -389 nT. Around the storm main phase, the equatorward boundary of the auroral oval extended ≤46.3° in invariant latitudes. This sequence also caused a solar proton event and Forbush decrease (≈3 per cent). These sequences indicate pile-up of multiple ICMEs, which even achieved a record value of inward magnetopause position. Our analyses of this historical pioneer event bring more insights into possible serious space weather hazards and provide a quantitative basis for future analyses and predictions.

    DOI： 10.1093/mnras/stab3615

    Web of Science

    Scopus

  3. The Variable Earth's Rotation in the 4th-7th Centuries: New Delta T Constraints from Byzantine Eclipse Records Reviewed

    Hayakawa Hisashi, Murata Koji, Soma Mitsuru

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC   Vol. 134 ( 1039 ) page： 094401 - 094401   2022.9

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Publications of the Astronomical Society of the Pacific  

    As one of the greatest astronomical spectacles, total solar eclipses have long been a subject of scientific interest and have been recorded by numerous civilizations over the millennia. These records are an essential reference for constraining and reconstructing Earth’s variable rotation (ΔT) prior to the 17th century. However, ΔT reconstructions for the 4th-7th centuries have significant uncertainties, mainly owing to a data scarcity. Here, we analyze Byzantine historical sources with reports of total solar eclipses along the Eastern Mediterranean coasts and add probable ΔT constraints on their basis. We examined five cases of total solar eclipses in 346, 418, 484, 601, and 693 CE, identified times and locations of the observations, and compared them with the existing ΔT spline curve to derive new ΔT constraints. Our results probably tighten ΔT variability in 346 CE, show a larger ΔT range in 418 CE, and give smaller ΔT ranges in 484, 601, and 693 CE. Our study tightens the existing ΔT variations and occasionally support some ΔT constraints that slightly depart from the ΔT spline curve in the latest reconstructions. Our results are consistent with contemporary ΔT constraints from other studies and offer an improved understanding of Earth’s variable rotation.

    DOI： 10.1088/1538-3873/ac6b56

    Web of Science

    Scopus

  4. Temporal Variations of the Three Geomagnetic Field Components at Colaba Observatory around the Carrington Storm in 1859 Reviewed International coauthorship

    Hayakawa, H., Nevanlinna, H., Blake, S. P., Ebihara, Y., Bhaskar, A. T., Miyoshi, Y.

    Astrophysical Journal   Vol. 928 ( 32 )   2022.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/ac2601

    DOI： 10.3847/1538-4357/ac2601

  5. A candidate auroral report in the Bamboo Annals, indicating a possible extreme space weather event in the early 10th century BCE

    van der Sluijs M.A., Hayakawa H.

    Advances in Space Research     2022

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    Publisher：Advances in Space Research  

    Historical auroral reports extend our knowledge of solar eruptions and long-term solar variability in the millennial time scale beyond the chronological coverage of instrumental observations, in the decadal to centennial time scales. Such chronological extensions benefit the scientific community, increasing the number of case studies on extreme space weather events with lower frequency but higher potential impact on modern technological infrastructure. So far, the earliest known datable reports of candidate aurorae have reached back to the 7th century BCE. Beyond this time series, we have analysed a celestial report in the Chinese Bamboo Annals that has attracted little scientific interest, probably owing to the controversial interpretations for the physical identity and the chronology of the event. Our philological analysis establishes its probable auroral nature. The textual description can be compared with early modern accounts of visual auroral observations for the multi-colour aurorae. We have located the observational site around Hàojīng (N34°14′, E108°46′) and dated the event to 977 ± 1 or 957 ± 1 BCE. On this basis, we have computed the equatorward extension of the auroral visibility as ≤39.0° in magnetic latitude and reconstructed the equatorward boundary of the auroral oval as ≤45.5° in invariant latitude. Our investigations empirically associate this candidate aurora with an extreme geomagnetic storm. We have compared this space weather event with proxy-based reconstructions of long-term solar variability and characterised it as a unique space-weather reference before the Neo-Assyrian Grand Minimum (alternatively Homeric Grand Minimum) in ca. 810 – 720 BCE.

    DOI： 10.1016/j.asr.2022.01.010

    Scopus

  6. Stephan Prantner’s Sunspot Observations during the Dalton Minimum Reviewed International coauthorship

    Hayakawa, H., Uneme, S., Besser, B. P., Iju, T., Imada, S.

    The Astrophysical Journal   Vol. 919   page： 1   2021.9

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abee1b

    DOI： 10.3847/1538-4357/abee1b

  7. The Extreme Space Weather Event in 1903 October/November: An Outburst from the Quiet Sun Reviewed International coauthorship

    Hayakawa Hisashi, Ribeiro Paulo, Vaquero Jose M., Cruz Gallego Maria, Knipp Delores J., Mekhaldi Florian, Bhaskar Ankush, Oliveira Denny M., Notsu Yuta, Carrasco Victor M. S., Caccavari Ana, Veenadhari Bhaskara, Mukherjee Shyamoli, Ebihara Yusuke

    ASTROPHYSICAL JOURNAL LETTERS   Vol. 897   page： L10   2020.7

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/2041-8213/ab6a18

    Web of Science

    Scopus

  8. Thaddaus Derfflinger's Sunspot Observations during 1802-1824: A Primary Reference to Understand the Dalton Minimum Reviewed International coauthorship

    Hayakawa Hisashi, Besser Bruno P., Iju Tomoya, Arlt Rainer, Uneme Shoma, Imada Shinsuke, Bourdin Philippe-A., Kraml Amand

    ASTROPHYSICAL JOURNAL   Vol. 890   page： 98   2020.2

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/ab65c9

    Web of Science

    Scopus

  9. Temporal and Spatial Evolutions of a Large Sunspot Group and Great Auroral Storms around the Carrington Event in 1859 Invited Reviewed International coauthorship

    Hayakawa, H., Ebihara, Y., Willis, D. M., Toriumi, S., Iju, T., Hattori, K., Wild, M. N., Oliveira, D. M., Ermolli, I., Ribeiro, J. R., Correia, A. P., Ribeiro, A. I., Knipp, D. J.

    Space Weather   Vol. 17   page： 1553 - 1569   2019.11

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2019SW002269

    DOI： 10.1029/2019SW002269

  10. Sunspot observations at Kawaguchi Science Museum: 1972-2013 Reviewed International coauthorship

    Hayakawa Hisashi, Suzuki Daisuke, Mathieu Sophie, Lefevre Laure, Takuma Hitoshi, Hiei Eijiro

    GEOSCIENCE DATA JOURNAL   Vol. 10 ( 1 ) page： 87 - 98   2023.1

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Geoscience Data Journal  

    Individual sunspot observations have formed a ground basis of international sunspot number, a unique reference for long-term solar variability in the centennial timescale. The original datasets were subjected to exploitations and analyses upon the recalibrations of the sunspot number series. In this context, this study reviewed and analysed original sunspot records and their databases in the Kawaguchi Science Museum (KSM) in Japan. KSM hosts sunspot drawings and logbooks from 1972 to 2013. This dataset has a longer chronological coverage than what was known to the scientific community (1981–2010). These records have been digitized and publicized in a museum database, which allows users to access individual sunspot drawings and numerical data in KSM logbooks. These records are highly homogeneous as a single observer's dataset (Hitoshi Takuma), who used a 15-cm refractor at the Kawaguchi Juvenile Museum in 1972–2003 and a 20-cm refractor at KSM in 2003–2013. We also reviewed the Takuma data series, his monthly observation days (21.3 days/month), sunspot number in the whole disk and each hemisphere, and sunspot positions in a butterfly diagram. We also assessed Takuma's data stability in comparison with the international sunspot number and reference datasets of the SILSO. Takuma's data appear stable until 2003, when he changed the observation site and instrument. His data stability was quantitatively compared with the SILSO reference datasets, confirming the substantial long-term stability of the data and establishing its reliability as an alternative reference for sunspot number recalibration.

    DOI： 10.1002/gdj3.158

    Web of Science

    Scopus

  11. Scale Transfer in 1849: Heinrich Schwabe to Rudolf Wolf Reviewed International coauthorship

    Bhattacharya S., Lefevre L., Hayakawa H., Jansen M., Clette F.

    SOLAR PHYSICS   Vol. 298 ( 1 ) page： 12 - 12   2023.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Solar Physics  

    The focus of this study is to reveal the reason behind a scale problem detected around 1849 in the historical version of the International Sunspot Number Series, i.e. version 1 (Leussu et al. in Astron. Astrophys.559, A28, 2013; Friedli in Solar Phys.291, 2505, 2016). From 1826 to 1848 Heinrich Schwabe’s observations were considered primary by Rudolf Wolf, and a shift of primary observer from Schwabe to Wolf in 1849 seems to have led to an inconsistency in the Sunspot Number series. In this study we benefited from various datasets, the most important being Schwabe’s raw counts from the Mittheilungen (Prof. Wolf’s Journals) that have been digitised at the Royal Observatory of Belgium between 2017 and 2019. We provide a robust quantification of the detected problem by using classic algebraic calculations, but also different methods such as a method inspired by Lockwood et al. (J. Geophys. Res.119(7), 5172, 2014), hence assigning a modern k-factor to Schwabe’s observations before 1849. We also assess the implications of this 1849 inconsistency on the International Sunspot Number series (Versions 1 and 2) before and after 1849.

    DOI： 10.1007/s11207-022-02103-4

    Web of Science

    Scopus

  12. A review for Japanese auroral records on the three extreme space weather events around the International Geophysical Year (1957–1958) Reviewed

    Hayakawa Hisashi, Ebihara Yusuke, Hata Hidetoshi

    Geoscience Data Journal   Vol. 10 ( 1 ) page： 142 - 157   2023.1

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    Solar Cycle 19 was probably the greatest solar cycle over the last four centuries and significantly disrupted the solar-terrestrial environments with a number of solar eruptions and resultant geomagnetic storms. At its peak, the International Geophysical Year (IGY: 1957–1958) was organised under international collaborations and benefitted scientific developments, capturing multiple unique extreme space weather events including the third and fourth greatest geomagnetic storms in the space age. In this article, we review and analyse original records of Japanese auroral observations around the IGY. These observations were organised by Masaaki Huruhata in collaboration with professional observatories and citizen contributors. We have digitised and documented these source documents, which comprise significant auroral displays in March 1957 (minimum Dst = −255 nT), September 1957 (minimum Dst = −427 nT), and February 1958 (minimum Dst = −426 nT). These records allow us to visualise temporal and spatial evolutions of these auroral displays, reconstruct their equatorward auroral boundaries down to 41.5°, 38.3°, and 33.3° in invariant latitudes, and contextualise their occurrences following contemporary geomagnetic disturbances. Our results have been compared with significant auroral displays during other extreme space weather events. These aurorae generally showed reddish colourations occasionally with yellowish rays. Their colourations are attributed to reddish oxygen emission and its mixture with greenish oxygen emission. Overall, these archival records provide the references for future discussions on the auroral activities during the uniquely intense and extreme space weather events.

    DOI： 10.1002/GDJ3.140

    CiNii Research

  13. Analyses of historical solar eclipse records in Hokkaido Island in the 18-19th centuries Reviewed

    Hayakawa Hisashi, Soma Mitsuru, Daigo Ryuma

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 74 ( 6 ) page： 1275 - 1286   2022.12

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/pasj/psac064

    Web of Science

  14. Inference of magnetic field during the Dalton minimum: Case study with recorded sunspot areas Reviewed International coauthorship

    Uneme Shoma, Imada Shinsuke, Lee Harim, Park Eunsu, Hayakawa Hisashi, Iju Tomoya, Moon Yong-Jae

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 74 ( 4 ) page： 767 - 776   2022.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Publications of the Astronomical Society of Japan  

    The Dalton minimum is considered to be one of the unique solar activity periods that have been captured in direct sunspot observations since 1610. Specifically, the solar magnetic field in this period is of great interest. Derfflinger and Prantner's sunspot observations of 1802-1824 and 1800-1844 are the most important references for this period. To understand the solar magnetic activity in the Dalton minimum, it is important to estimate the latitude/longitude distribution of the sunspots and the sunspot areas for that duration. In this study, we analyze Derfflinger and Prantner's sunspot drawings to determine the sunspot parameters, particularly the sunspot area. We find that the sunspot areas obtained from Derfflinger's drawings are overemphasized by a factor of eight relative to those derived from modern observations. We also analyze Prantner's sunspot drawings to validate our analysis of Derfflinger's drawings. Further, we generate solar magnetograms from Derfflinger's sunspot drawings using a deep-learning model based on conditional generative adversarial networks. Our analysis of these sunspot areas will provide important information for restoring the magnetograms during the Dalton minimum.

    DOI： 10.1093/pasj/psac032

    Web of Science

    Scopus

  15. A review for Japanese auroral records on the three extreme space weather events around the International Geophysical Year (1957–1958) Reviewed

    Hayakawa H., Ebihara Y., Hata H.

    Geoscience Data Journal     2022.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/gdj3.140

    DOI： 10.1002/gdj3.140

    Scopus

    Other Link： https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/gdj3.140

  16. Analyses of a datable solar eclipse record in Maya Classic period monumental inscriptions Reviewed International coauthorship

    Hayakawa Hisashi, Soma Misturu, Kinsman J. Hutch

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 73 ( 6 ) page： L31 - L36   2021.12

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/pasj/psab088

    Web of Science

    Scopus

  17. Analyses of Early Sunspot Records by Jean Tarde (1615-1617) and Jan Smogulecki (1621-1625) Reviewed

    Carrasco V. M. S., Gallego M. C., Alvarez J. Villalba, Vaquero J. M., Hayakawa H.

    SOLAR PHYSICS   Vol. 296 ( 11 )   2021.11

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    Authorship：Last author   Language：English  

    DOI： 10.1007/s11207-021-01905-2

    Web of Science

    Scopus

  18. Johann Christoph Müller’s Sunspot Observations in 1719 – 1720: Snapshots of the Immediate Aftermath of the Maunder Minimum Reviewed International coauthorship

    Hayakawa, H., Iju, T., Kuroyanagi, C., Carrasco, V. M. S., Besser, B. P., Uneme, S., Imada, S.

    SOLAR PHYSICS   Vol. 296 ( 154 )   2021.10

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11207-021-01880-8

    DOI： 10.1007/s11207-021-01880-8

  19. The extreme space weather events in October 1788 Reviewed

    Hattori Kentaro, Hayakawa Hisashi, Ebihara Yusuke

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 73 ( 5 ) page： 1367 - 1374   2021.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/pasj/psab079

    Web of Science

    Scopus

  20. Reanalyses of the sunspot observations of Fogelius and Siverus: two 'long-term' observers during the Maunder minimum Reviewed International coauthorship

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 506 ( 1 ) page： 650 - 658   2021.9

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/mnras/staa2965

    DOI： 10.1093/mnras/staa2965

    Web of Science

  21. The extreme space weather events in October 1788 Reviewed

    Hattori, K., Hayakawa, H., Ebihara, Y.

    Publications of the Astronomical Society of Japan   Vol. 73   page： 1367 - 1374   2021.8

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    Language：English   Publishing type：Research paper (scientific journal)  

  22. PSTEP: project for solar-terrestrial environment prediction Invited Reviewed International coauthorship

    Kusano, Kanya; Ichimoto, Kiyoshi; Ishii, Mamoru; Miyoshi, Yoshizumi; Yoden, Shigeo; Akiyoshi, Hideharu; Asai, Ayumi; Ebihara, Yusuke; Fujiwara, Hitoshi; Goto, Tada-Nori; Hanaoka, Yoichiro; Hayakawa, Hisashi; Hosokawa, Keisuke; Hotta, Hideyuki; Hozumi, Kornyanat; Imada, Shinsuke; Iwai, Kazumasa; Iyemori, Toshihiko; Jin, Hidekatsu; Kataoka, Ryuho; Katoh, Yuto; Kikuchi, Takashi; Kubo, Yûki; Kurita, Satoshi; Matsumoto, Haruhisa; Mitani, Takefumi; Miyahara, Hiroko; Miyoshi, Yasunobu; Nagatsuma, Tsutomu; Nakamizo, Aoi; Nakamura, Satoko; Nakata, Hiroyuki; Nishizuka, Naoto; Otsuka, Yuichi; Saito, Shinji; Saito, Susumu; Sakurai, Takashi; Sato, Tatsuhiko; Shimizu, Toshifumi; Shinagawa, Hiroyuki; Shiokawa, Kazuo; Shiota, Daikou; Takashima, Takeshi; Tao, Chihiro; Toriumi, Shin; Ueno, Satoru; Watanabe, Kyoko; Watari, Shinichi; Yashiro, Seiji; Yoshida, Kohei; Yoshikawa, Akimasa

    Earth, Planets and Space   Vol. 73   page： 159   2021.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1186/s40623-021-01486-1

    DOI： 10.1186/s40623-021-01486-1

  23. Strong evidence of low levels of solar activity during the Maunder Minimum Reviewed International coauthorship

    Carrasco, V. M. S., Hayakawa, H., Kuroyanagi, C., Gallego, M. C., Vaquero, J. M.

    Monthly Notices of the Royal Astronomical Society     2021.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/mnras/stab1155

    DOI： 10.1093/mnras/stab1155

  24. Timelines as a tool for learning about space weather storms Invited Reviewed International coauthorship

    Knipp, D. J., Bernstein, V., Wahl, K., Hayakawa, H.

    Journal of Space Weather and Space Climate   Vol. 11   page： 29 - 29   2021.4

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1051/swsc/2021011

    DOI： 10.1051/swsc/2021011

  25. The intensity and evolution of the extreme storms in 1938 January Reviewed International coauthorship

    Hayakawa, H., Hattori, K., Pevtsov, A. A., Ebihara, Y., Shea, M. A., McCracken, K. G., Daglis, I. A., Bhaskar, A., Ribeiro, P., Knipp, D. J.

    Astrophysical Journal   Vol. 909   page： 197   2021.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abc427

    DOI： 10.3847/1538-4357/abc427

  26. Three Case Reports on the Cometary Plasma Tail in the Historical Documents Reviewed

    Hayakawa, H., Fujii, Y. I., Murata, K., Mitsuma, Y., Cheng, Y., Nogami, N., Ichikawa, K., Sano, H., Tsumura, K., Kawamoto, Y., Nishino, M. N.

    Journal of Space Weather and Space Climate   Vol. 11   page： 21   2021.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1051/swsc/2020045

    DOI： 10.1051/swsc/2020045

  27. Candidate Auroral Observations Indicating a Major Solar–Terrestrial Storm in 1680: Implication for Space Weather Events during the Maunder Minimum Reviewed International coauthorship

    Hayakawa, H., Schlegel, K., Besser, B. P., Ebihara, Y.

    Astrophysical Journal   Vol. 909   page： 29   2021.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abb3c2

    DOI： 10.3847/1538-4357/abb3c2

  28. Sunspot Observations at the Eimmart Observatory and its Neighbourhood during the Late Maunder Minimum (1681 – 1718) Reviewed International coauthorship

    Hayakawa, H., Kuroyanagi, C., Carrasco, V. M. S., Uneme, S., Besser, B. P., Sôma, M., Imada, S.

    Astrophysical Journal   Vol. 909   page： 166   2021.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abd949

    DOI： 10.3847/1538-4357/abd949

  29. Daniel Mögling's sunspot observations in 1626 - 1629: A manuscript reference for the solar activity before the Maunder Minimum Reviewed International coauthorship

    Hayakawa, H., Iju, T., Murata, K., Besser, B. P.

    Astrophysical Journal   Vol. 909   page： 194   2021.3

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abdd34

    DOI： 10.3847/1538-4357/abdd34

  30. Graphical evidence for the solar coronal structure during the Maunder minimum: Comparative study of the total eclipse drawings in 1706 and 1715 Reviewed International coauthorship

    Hayakawa H. Lockwood, M., Owens, M. J., Sôma, M., Besser, B. P., van Driel, L.

    Journal of Space Weather and Space Climate   Vol. 11   page： 1   2021.2

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1051/swsc/2020035

    Scopus

  31. The Dalton Minimum and John Dalton’s Auroral Observations Reviewed International coauthorship

    Silverman, S. M., Hayakawa, H.

    Journal of Space Weather and Space Climate   Vol. 11   page： 17   2021.2

    　More details

    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1051/swsc/2020082

    DOI： 10.1051/swsc/2020082

  32. The Extreme Space Weather Event in 1941 February/March Reviewed International coauthorship

    Hayakawa, H., Blake, S. P., Bhaskar, A., Hattori, K., Oliveira, D. M., Ebihara, Y.

    Astrophysical Journal   Vol. 908   page： 209   2021.2

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abb772

    DOI： 10.3847/1538-4357/abb772

  33. Cometary records revise Eastern Mediterranean chronology around 1240 CE Reviewed

    Murata, K., Ichikawa, K., Fujii, Y. I., Hayakawa, H., Cheng, Y., Kawamoto, Y., Sano, H.

    Publications of the Astronomical Society of Japan   Vol. 73   page： 197 - 204   2021.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/pasj/psaa114

    DOI： 10.1093/pasj/psaa114

  34. [研究活動]研究トピックス : 歴史文献とアナログ観測記録に見る宇宙天気現象と太陽活動 Invited

    早川 尚志

    京都大学大学院理学研究科附属天文台年次報告   Vol. 2019年(令和元年)   page： 20 - 21   2021.1

    　More details

    Language：Japanese   Publisher：京都大学大学院理学研究科附属天文台  

    CiNii Research

  35. Estimating Satellite Orbital Drag During Historical Magnetic Superstorms Reviewed International coauthorship

    Oliveira Denny M., Zesta Eftyhia, Hayakawa Hisashi, Bhaskar Ankush

    SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS   Vol. 18 ( 11 ) page： e2020SW002472   2020.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2020SW002472

    Web of Science

    Scopus

  36. On the Size of the Flare Associated with the Solar Proton Event in 774 AD Reviewed International coauthorship

    ASTROPHYSICAL JOURNAL   Vol. 903   page： 41   2020.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/abad93

    Web of Science

    Scopus

  37. An Analysis of Trouvelot's Auroral Drawing on 1/2 March 1872: Plausible Evidence for Recurrent Geomagnetic Storms Reviewed International coauthorship

    Bhaskar Ankush, Hayakawa Hisashi, Oliveira Denny M., Blake Sean, Silverman Sam M., Ebihara Yusuke

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   Vol. 125 ( 10 ) page： e2020JA028227   2020.10

    　More details

    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2020JA028227

    Web of Science

    Scopus

  38. Intensity and time series of extreme solar-terrestrial storm in 1946 March Reviewed International coauthorship

    Hayakawa Hisashi, Ebihara Yusuke, Pevtsov Alexei A., Bhaskar Ankush, Karachik Nina, Oliveira Denny M.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 497 ( 4 ) page： 5507 - 5517   2020.10

    　More details

    Authorship：Lead author,　Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/mnras/staa1508

    Web of Science

    Scopus

  39. The Solar Corona during the Total Eclipse on 1806 June 16: Graphical Evidence of the Coronal Structure during the Dalton Minimum Reviewed International coauthorship

    Hayakawa Hisashi, Owens Mathew J., Lockwood Michael, Soma Mitsuru

    ASTROPHYSICAL JOURNAL   Vol. 900   page： 114   2020.9

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/ab9807

    Web of Science

    Scopus

  40. South American auroral reports during the Carrington storm Reviewed International coauthorship

    Hayakawa Hisashi, Ribeiro Jose R., Ebihara Yusuke, Correia Ana P., Soma Mitsuru

    EARTH PLANETS AND SPACE   Vol. 72   page： 122   2020.8

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1186/s40623-020-01249-4

    Web of Science

    Scopus

  41. A possible case of sporadic aurora observed at Rio de Janeiro Reviewed International coauthorship

    Oliveira Denny M., Hayakawa Hisashi, Bhaskar Ankush, Zesta Eftyhia, Vichare Geeta

    EARTH PLANETS AND SPACE   Vol. 72   page： 82   2020.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1186/s40623-020-01208-z

    Web of Science

    Scopus

  42. Provenance of the cross sign of 806 in the Anglo-Saxon Chronicle: a possible lunar halo over continental Europe? International coauthorship

    Uchikawa Yuta, Cowley Les, Hayakawa Hisashi, Willis David M., Stephenson F. Richard

    HISTORY OF GEO- AND SPACE SCIENCES   Vol. 11 ( 1 ) page： 81 - 92   2020.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/hgss-11-81-2020

    Web of Science

    Scopus

  43. Sunspot Observations by Hisako Koyama: 1945 – 1996 Reviewed International coauthorship

    Hayakawa, H., Clette, F., Horaguchi, T., Iju, T., Knipp, D. J., Liu, H., Nakajima, T.

    Monthly Notices of the Royal Astronomical Society   Vol. 492   page： 4513 - 4527   2020.3

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1093/mnras/stz3345

  44. What Can Be Learned from Modern Data?

    Kusano K., Cliver E., Hayakawa H., Kovaltsov G. A., Usoskin I. G.

    EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN     2020

    　More details

  45. Further Search for Extreme Events

    Miyake F., Ebihara Y., Hayakawa H., Maehara H., Mitsuma Y., Usoskin I., Wang F., Willis D. M.

    EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN     2020

    　More details

  46. Characterization of the Measured Events

    Cliver E., Ebihara Y., Hayakawa H., Jull T., Mekhaldi F., Miyake F., Muscheler R.

    EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN     2020

    　More details

  47. The Earliest Candidates of Auroral Observations in Assyrian Astrological Reports: Insights on Solar Activity around 660 BCE Reviewed International coauthorship

    Hayakawa Hisashi, Mitsuma Yasuyuki, Ebihara Yusuke, Miyake Fusa

    ASTROPHYSICAL JOURNAL LETTERS   Vol. 884   page： L18   2019.10

    　More details

    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/2041-8213/ab42e4

    Web of Science

    Scopus

  48. A Transit of Venus Possibly Misinterpreted as an Unaided-Eye Sunspot Observation in China on 9 December 1874

    Hayakawa Hisashi, Soma Mitsuru, Tanikawa Kiyotaka, Willis David M., Wild Matthew N., Macdonald Lee T., Imada Shinsuke, Hattori Kentaro, Stephenson F. Richard

    SOLAR PHYSICS   Vol. 294 ( 9 )   2019.9

    　More details

    Publisher：Solar Physics  

    DOI： 10.1007/s11207-019-1504-9

    Web of Science

    Scopus

  49. Revisiting Kunitomo's Sunspot Drawings During 1835-1836 in Japan

    Fujiyama Masashi, Hayakawa Hisashi, Iju Tomoya, Kawai Toshiki, Toriumi Shin, Otsuji Kenichi, Kondo Katsuya, Watanabe Yusaku, Nozawa Satoshi, Imada Shinsuke

    SOLAR PHYSICS   Vol. 294 ( 4 )   2019.4

    　More details

    Publisher：Solar Physics  

    DOI： 10.1007/s11207-019-1429-3

    Web of Science

    Scopus

  50. The extreme space weather event in September 1909

    Hayakawa Hisashi, Ebihara Yusuke, Cliver Edward W., Hattori Kentaro, Toriumi Shin, Love Jeffrey J., Umemura Norio, Namekata Kosuke, Sakaue Takahito, Takahashi Takuya, Shibata Kazunari

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 484 ( 3 ) page： 4083 - 4099   2019.4

    　More details

    Publisher：Monthly Notices of the Royal Astronomical Society  

    DOI： 10.1093/mnras/sty3196

    Web of Science

    Scopus

  51. Sunspot drawings by Japanese official astronomers in 1749-1750

    Hayakawa Hisashi, Iwahashi Kiyomi, Fujiyama Masashi, Kawai Toshiki, Toriumi Shin, Hotta Hideyuki, Iijima Haruhisa, Imada Shinsuke, Tamazawa Harufumi, Shibata Kazunari

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70 ( 4 )   2018.8

    　More details

    Publisher：Publications of the Astronomical Society of Japan  

    DOI： 10.1093/pasj/psy066

    Web of Science

    Scopus

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To the head of Papers.▲

Books 3

  1. 小樽学：港町から地域を考える

    醍醐龍馬（ Role： Contributor ,  第10章、コラム8）

    日本経済評論社  2023.3 

    　More details

    Language：Japanese Book type：General book, introductory book for general audience

  2. Solar-Terrestrial Environmental Prediction International journal

    Kanya Kusano（ Role： Contributor ,  Explorations of Extreme Space Weather Events from Stellar Observations and Archival Investigations）

    Springer  2023.2 

    　More details

    Total pages：462   Responsible for pages：327-376   Language：English Book type：Scholarly book

    DOI： 10.1007/978-981-19-7765-7

  3. Extreme Solar Particle Storms The hostile Sun International journal

    （ Role： Contributor）

    IOP   2019.12 

    　More details

    Language：English Book type：Scholarly book

    DOI： https://doi.org/10.1088/2514-3433/ab404a

To the head of Books.▲

Presentations 24

  1. Revisiting Carrington space weather event with archival investigations Invited International conference

    Hisashi Hayakawa

    Space Climate 8  2022.9.19  Space Climate

    　More details

    Event date： 2022.9

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Krakow   Country：Poland  

  2. Preliminary Archival Analyses for the Solar-Terrestrial Superstorm in February 1872 Invited International conference

    Hisashi Hayakawa

    Asia Oceania Geosciences Society 2022  2022.8.4  Asia Oceania Geosciences Society

    　More details

    Event date： 2022.8

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Online  

  3. Historical Auroral Displays and Millennial Space-Weather History Invited International conference

    Hisashi Hayakawa

    COSPAR 2022  2022.7.20  COSPAR & Athens Observatory

    　More details

    Event date： 2022.7

    Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

    Venue：Athens   Country：Greece  

  4. An overview of the historical space climate, as seen from the historical archives and classics Invited International conference

    Hisashi Hayakawa

    EGU GIFT Workshop  2022.4.5  European Geosciences Union

    　More details

    Event date： 2022.4

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Online  

  5. Extreme space weather events in the observational history: the Carrington event and others Invited International conference

    Hisashi Hayakawa, Yusuke Ebihara, & Kentaro Hattori

    Asia Oceania Geosciences Society 2021  2021.8.3 

    　More details

    Event date： 2021.8

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：virtual  

  6. 歴史文献から見る過去の太陽嵐 Invited

    早川尚志

    第29回NPO法人花山星空ネットワーク講演会  2022.12.4  NPO法人花山星空ネットワーク

    　More details

    Event date： 2022.12

    Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

    Venue：オンライン  

  7. 黒点数再較正と信州黒点観測記録群

    早川尚志

    シンポジウム「長野県は宇宙県」の天文史100年と市民科学」  2022.11.18  国語研

    　More details

    Event date： 2022.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：諏訪   Country：Japan  

  8. Archival Reanalyses for the Carrington event: Case Studies International conference

    Hisashi Hayakawa

    ISEE Symposium 2022  2022.11.15  ISEE, Nagoya University

    　More details

    Event date： 2022.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Nagoya   Country：Japan  

  9. Archival Reanalyses of the Carrington event in 1859 International conference

    Hisashi Hayakawa

    European Space Weather Week 2022  2022.10.27 

    　More details

    Event date： 2022.10

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Zagreb  

  10. The general crisis in the 17th century: a viewpoint of the solar-terrestrial environment International conference

    Hisashi Hayakawa

    Asian Association of World Histories 2022  2022.10.13  Asian Association of World Histories

    　More details

    Event date： 2022.10

    Language：English   Presentation type：Symposium, workshop panel (public)  

    Venue：New Delhi   Country：India  

  11. The extreme solar storms in the past: several case studies for January 1938 and September 1859 Invited International conference

    Hisashi Hayakawa

    EU Safe Space 2022  2022.7.17  Athens Observatory

    　More details

    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Athens   Country：Greece  

  12. Archival snapshots of the Maunder Minimum in the Eimmart Collections International conference

    Hisashi Hayakawa

    COSPAR 2022  2022.7.19  COSPAR

    　More details

    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Athens   Country：Greece  

  13. ニュートン書簡集とマウンダー極小期―18世紀初頭の太陽地球環境変動の事例研究 Invited

    早川尚志

    日本科学史学会   2022.5.29 

    　More details

    Event date： 2022.5

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：オンライン  

  14. A brief overview on the archival investigations for the historical solar storms: past, present, and future International conference

    Hisashi Hayakawa

    Extreme solar particle storms at Earth  2022.3.28  The University of Oulu

    　More details

    Event date： 2022.3

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Rokua   Country：Finland  

  15. 歴史文献による過去3000年間の激甚太陽嵐の調査と定量復元

    早川尚志

    『知の開拓者』コンソーシアム総会  2022.3.7 

    　More details

    Event date： 2022.3

    Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

  16. 過去の観測記録から復元する1940年3月の激甚宇宙天気現象

    早川尚志

    日本天文学会 2022春  2022.3.2 

    　More details

    Event date： 2022.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：広島大学  

  17. Historical observations of intensities and time series of the extreme space weather events in the 1940s International coauthorship International conference

    Hisashi Hayakawa, Alexei A. Pevtsov, Denny M. Oliveira, Seán P. Blake, Kentaro Hattori, Ankush T. Bhaskar, Nina Karachik, and Yusuke Ebihara

    SCOSTEP's 15th Quadrennial Solar-Terrestrial Physics Symposium  2022.2.25 

    　More details

    Event date： 2022.2

    Language：English   Presentation type：Oral presentation (general)  

    Country：India  

  18. Archival investigations of extreme space weather events with the historical documents International conference

    Hisashi Hayakawa

    ISSI 2021, Solar Extreme Events: Setting Up a Paradigm  2021.9.30 

    　More details

    Event date： 2021.9 - 2021.10

    Language：English   Presentation type：Oral presentation (invited, special)  

  19. オーストリアの修道院文献から復元するダルトン極小期の太陽活動

    Hisashi Hayakawa, Tomoya Iju, Shinsuke Imada

    日本天文学会 2021秋  2021.9.13 

    　More details

    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都産業大学  

  20. Analyses of the Extreme Solar and Geomagnetic Storms in March 1940 International coauthorship International conference

    Hisashi Hayakawa*, Denny M. Oliveira, Margaret A. Shea, Don F. Smart, Seán P. Blake, Kentaro Hattori, Ankush T. Bhaskar, Juan J. Curto, Daniel R. Franco, and Yusuke Ebihara

    Joint Scientific Assembly IAGA-IASPEI 2021  2021.8.23 

    　More details

    Event date： 2021.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：virtual  

  21. 過去1.8世紀の歴史的アナログ記録に基づく激甚磁気嵐の規模推定の事例研究 Invited

    早川尚志、海老原祐輔、服部健太郎

    地球電磁気・地球惑星圏学会  2020.11.4 

    　More details

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

  22. Extreme space weather events in the observational history: the Carrington event and others Invited

    Hayakawa, H., Ebihara, Y., Hattori, K.

    Asia Oceania Geosciences Society 2021  2021.8.3 

    　More details

    Language：English   Presentation type：Oral presentation (invited, special)  

  23. Analyses of the Extreme Solar and Geomagnetic Storms in March 1940 International coauthorship International conference

    Hayakawa, H., Oliveira, D. M., Shea, M. A., Smart, D. F., Blake, S. P., Hattori, K., Bhaskar, A. T., Curto, J. J., Franco, D. R., Ebihara, Y.

    IAGA-IASPEI Assembly 2021  2021.8.23 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  24. The solar activity in the Dalton Minimum, as reconstructed from the Austrian monasterial documents

    Hayakawa, H., Iju, T., Imada, S.

    Astronomical Society of Japan  2021.9.13 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

▼display all

To the head of Presentations.▲

Research Project for Joint Research, Competitive Funding, etc. 2

  1. Feasibility researches on the quantitative environmental history: a case study for the crisis of the 17th-century and its comparison

    2020.9 - 2021.3

    　 More details

    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\1500000

  2. アナログ観測記録・歴史文献に基づく過去の太陽活動と宇宙天気の復元

    2020.8 - 2021.3

    京都大学  生存圏科学 ミッション研究 

    　 More details

    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\560000

To the head of Research Project for Joint Research, Competitive Funding, etc..▲

KAKENHI (Grants-in-Aid for Scientific Research) 4

  1. 同時代黒点観測の歴史的文書に基づくダルトン極小期復元の試験的検討

    Grant number：21K13957  2021.4 - 2024.3

    科学研究費助成事業  若手研究

    早川 尚志

    　 More details

    Authorship：Principal investigator 

    Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）

    19世紀前半の太陽活動は例外的に静穏で、「ダルトン極小期」と呼称される。しかしこの頃の太陽活動の直接観測については、記録自体が歴史文献に記録され、その分析に太陽物理学のみならず歴史学・文献学の知見を要するため、必ずしも定量的復元が十全に行われているとは言い難い。そこで、本研究では、実際に当時の観測記録を複写、歴史学・文献学的に記述を解読し、現代太陽物理学の知見を適用して、当時の太陽活動を黒点数、黒点分布の試験的復元を行い、長期の地磁気変動と比較する。この時期のデータを過去410年の観測記録と比較し、ダルトン極小期の太陽活動の観測記録を現代科学観測の知見とどこまで定量的に比較できるか検証する。

  2. 多核種分析による完新世の極端太陽現象の頻度と規模解明

    Grant number：20H00173  2020.4 - 2021.3

    科学研究費助成事業  基盤研究(A)

    三宅 芙沙, 堀内 一穂, 宮原 ひろ子, 笹 公和, 箱崎 真隆, 前原 裕之, 木村 勝彦, 門叶 冬樹, 早川 尚志

    　 More details

    Authorship：Coinvestigator(s) 

    樹木年輪の14Cや氷床コアの10Be、36Clといった宇宙線生成核種は、観測史上最大とされ
    る1956年のSEP（Solar Energetic Particle）イベントの数十倍という過去の超巨大SEPイ
    ベントの優れた代替データである。本研究は、主に年輪の14C分析から、完新世（
    過去1万2千年間）における最大のSEPイベントの同定と、超巨大SEPイベントの発生頻度及
    びその発生特性の解明を目的とする。我々の太陽における発生特性を、太陽型恒星の恒星
    フレアと比較することで、太陽型恒星における太陽の普遍性と特殊性を評価する。
    樹木年輪の炭素１４や氷床コアのベリリウム１０、塩素３６といった宇宙線生成核種は、直接観測で見つかっている最大のSEP（Solar Energetic Particle）イベントの数十倍という過去の超巨大SEPイベントの優れた代替データである。これまでに我々の宇宙線生成核種の分析から、775年や994年などの超巨大SEPイベントの痕跡を発見した（Miyake et al. 2012, 2013）。これは、我々の太陽でスーパーフレアが発生した可能性を示すだけでなく、現代社会に甚大な影響を与え得る極端太陽現象が将来発生する可能性を示すものである。本研究は、宇宙線生成核種の分析から、完新世（過去1万2千年間）における最大のSEPイベントの同定と、超巨大SEPイベントの発生頻度及びその発生特性の解明を目的とする。
    今年度は、長期的な樹木年輪の炭素１４分析を実施するために、樹木試料の手配（日本、フィンランド、カリフォルニア産の樹木サンプル）や、試料調製装置（木片試料からグラファイト試料の抽出）の性能チェック、さらに分析に必要な環境作りを行った。また、SEPイベントのエネルギースペクトルを評価する上で要となる塩素３６の（南極ドームふじ氷床コア）分析を行った。さらに、トラバーチン堆積物のベリリウム１０データに過去の大規模SEPイベントがみられるか調査する足掛かりとして、トラバーチン分析を行うための環境整備を行った。
    令和2年度が最終年度であるため、記入しない。
    令和2年度が最終年度であるため、記入しない。

  3. Cultural Astronomy of "Astro-Nagano" Project from the viewpoint of Citizen Science

    Grant number：22K02956  2022.4 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship：Coinvestigator(s) 

  4. A preliminary study for magnitude estimates and quantitative comparisons of the extreme space weather events based on the early modern analog observational records

    Grant number：20K22367  2020.9 - 2022.3

    JSPS 

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\2860000 （ Direct Cost: \2200000 、 Indirect Cost：\660000 ）

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Teaching Experience (Off-campus) 3

  1. 人文学概論

    2021.1 （Osaka University）

  2. 交流史研究A

    2020.4 - 2020.9 （Daito Bunka University）

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    Level：Undergraduate (specialized) 

  3. 比較文明論演習A

    2020.4 - 2020.9 （Daito Bunka University）

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    Level：Undergraduate (specialized) 

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Media Coverage 11

  1. 赤いオーロラ～幻の夜空がよみがえる TV or radio program

    NHK総合　北海道道  NHK  2022.11

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    Author：Other 

  2. ナゾの巨大爆発 スーパーフレア TV or radio program

    NHKコズミックフロント  NHK  https://www.nhk.jp/p/cosmic/ts/WXVJVPGLNZ/episode/te/99N2J99R2Q/  2022.5

  3. BBC Sky at Night, Stars: A Matter of Life and Death TV or radio program

    BBC  BBC  Interview; https://www.bbc.co.uk/programmes/m000kxjy  2020.7

  4. Astronomers use Byzantine chronicles to learn about the Earth’s rotation Internet

    Medievalists.net  Medievalists.net  https://www.medievalists.net/2022/09/byzantine-chronicles-earths-rotation/  2022.9

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    Author：Other 

  5. Scientists study Earth's rotation changes through Byzantine eclipses Newspaper, magazine

    The Jerusalem Post  The Jerusalem Post  https://www.jpost.com/science/article-717565  2022.9

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    Author：Other 

  6. The Northern Lights: A History of Aurora Sightings Newspaper, magazine

    The Discover Magazine  The Discover Magazine  https://www.discovermagazine.com/planet-earth/the-northern-lights-a-history-of-aurora-sightings  2022.5

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    Author：Other 

  7. Earliest documented aurora found in ancient Chinese text Internet

    Live Science  Live Science  https://www.livescience.com/oldest-description-candidate-aurora  2022.4

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    Author：Other 

  8. 中國歷史文獻發現最早的極光記載 Newspaper, magazine

    科技新報  科技新報  2022.4

  9. Scientists find oldest description of an aurora, or northern lights, in ancient Chinese texts

    South China Morning Post  South China Morning Post  https://www.scmp.com/news/people-culture/article/3174425/scientists-find-oldest-description-aurora-or-northern-lights  2022.4

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    Author：Other 

  10. Scientists find earliest record of aurora in ancient Chinese chronicle Newspaper, magazine

    Independent  Independent  https://www.independent.co.uk/space/aurora-earliest-record-ancient-china-b2056947.html  2022.4

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    Author：Other 

  11. 巨木の年輪に刻まれた太陽の異変

    日経サイエンス  日経サイエンス  巨木の年輪に刻まれた太陽の異変  2022.4

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    Author：Other 

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