研究者詳細 - 三宅　芙沙

論文 - 三宅　芙沙

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Miyake F.

Proceedings of Science 358 巻 2021年7月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Proceedings of Science

Terrestrial cosmogenic nuclides (e.g., 14C, 10Be, and 36Cl) are primarily produced by galactic cosmic rays. However, a certain amount of these nuclides is also produced by solar energetic particles (SEPs) derived from sporadic solar events such as solar flares and coronal mass ejections. Cosmic ray increase events in AD 774/775, AD 993/994 (or AD 992/993), and ~BC 660 have been discovered using 14C data in tree rings (Miyake et al. 2012, 2013; Park et al. 2017). It is considered that the most plausible cause of these events was an extreme SEP events with very hard energy spectra based on 14C analyses of tree rings and 10Be and 36Cl analyses of ice cores (e.g., Mekhaldi et al. 2015; Miyake et al. 2015, 2019; Büntgen et al. 2018; O'Hare et al. 2019). These SEP events are estimated to be several dozens of times larger than the largest events seen in direct observations, and an event of that size might have a serious impact on modern society. Therefore, it is important to investigate the occurrence rate of past extreme events. In recent years, surveys of past SEP events have been actively conducted via cosmogenic nuclide measurements with high time resolution (~one-year resolution). Here the detected past SEP candidates and a further survey of similar events are reviewed.

Scopus

樹木年輪中炭素を用いたキャリントンSEP(Solar Energetic Particle)イベントの探査

多田悠馬, 三宅芙沙, 菅澤佳世, 中村俊夫, 中塚武, 門叶冬樹, 坂本稔, 箱崎真隆

応用物理学会学術講演会講演予稿集 2020.2 巻頁： 356 - 356 2020年8月

FINDINGS FROM AN IN-DEPTH ANNUAL TREE-RING RADIOCARBON INTERCOMPARISON 査読有り国際共著国際誌

Wacker, L; Scott, EM; Bayliss, A; Brown, D; Bard, E; Bollhalder, S; Friedrich, M; Capano, M; Cherkinsky, A; Chivall, D; Culleton, BJ; Dee, MW; Friedrich, R; Hodgins, GWL; Hogg, A; Kennett, DJ; Knowles, TDJ; Kuitems, M; Lange, TE; Miyake, F; Nadeau, MJ; Nakamura, T; Naysmith, JP; Olsen, J; Omori, T; Petchey, F; Philippsen, B; Ramsey, CB; Prasad, GVR; Seiler, M; Southon, J; Staff, R; Tuna, T

RADIOCARBON 62 巻 ( 4 ) 頁： 873 - 882 2020年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Radiocarbon

The radiocarbon (C) calibration curve so far contains annually resolved data only for a short period of time. With accelerator mass spectrometry (AMS) matching the precision of decay counting, it is now possible to efficiently produce large datasets of annual resolution for calibration purposes using small amounts of wood. The radiocarbon intercomparison on single-year tree-ring samples presented here is the first to investigate specifically possible offsets between AMS laboratories at high precision. The results show that AMS laboratories are capable of measuring samples of Holocene age with an accuracy and precision that is comparable or even goes beyond what is possible with decay counting, even though they require a thousand times less wood. It also shows that not all AMS laboratories always produce results that are consistent with their stated uncertainties. The long-term benefits of studies of this kind are more accurate radiocarbon measurements with, in the future, better quantified uncertainties.

DOI： 10.1017/RDC.2020.49

Web of Science

Scopus

775 and 994 14C events in the tree-rings of northern Japanese trees 国際誌

M. Hakozaki, F. Miyake, T. Nakamura

Proceedings of EA-AMS 8 & JAMS-22 頁： 89 - 90 2020年6月

Characterization of the Measured Events 国際誌

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

EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN 2020年

Measurements of Radionuclides 国際誌

Wacker, L; Baroni, M; Mekhaldi, F; Miyake, F; Oinonen, M

EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN 2020年

Further Search for Extreme Events 国際誌

Miyake, F; Ebihara, Y; Hayakawa, H; Maehara, H; Mitsuma, Y; Usoskin, I; Wang, F; Willis, DM

EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN 2020年

Extreme Solar Particle Storms The hostile Sun Introduction 国際誌

Usoskin, I; Miyake, F

EXTREME SOLAR PARTICLE STORMS: THE HOSTILE SUN 2020年

古木から読み解く過去の宇宙

三宅芙沙

日本歴史 870号（11月号）巻頁： 74 - 75 2020年

高精度14Cデータから明かされる過去の宇宙線増加現象招待有り査読有り

三宅芙沙

放射線 45 巻頁： 144 - 149 2020年

Radiocarbon Production Events and their Potential Relationship with the Schwabe Cycle 査読有り国際誌

Scifo, A; Kuitems, M; Neocleous, A; Pope, BJS; Miles, D; Jansma, E; Doeve, P; Smith, AM; Miyake, F; Dee, MW

SCIENTIFIC REPORTS 9 巻 ( 1 ) 頁： 17056 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Reports

Extreme cosmic radiation events occurred in the years 774/5 and 993/4 CE, as revealed by anomalies in the concentration of radiocarbon in known-age tree-rings. Most hypotheses point towards intense solar storms as the cause for these events, although little direct experimental support for this claim has thus far come to light. In this study, we perform very high-precision accelerator mass spectrometry (AMS) measurements on dendrochronological tree-rings spanning the years of the events of interest, as well as the Carrington Event of 1859 CE, which is recognized as an extreme solar storm even though it did not generate an anomalous radiocarbon signature. Our data, comprising 169 new and previously published measurements, appear to delineate the modulation of radiocarbon production due to the Schwabe (11-year) solar cycle. Moreover, they suggest that all three events occurred around the maximum of the solar cycle, adding experimental support for a common solar origin.

DOI： 10.1038/s41598-019-53296-x

Web of Science

Scopus

PubMed

The Earliest Candidates of Auroral Observations in Assyrian Astrological Reports: Insights on Solar Activity around 660 BCE 査読有り国際誌

Hayakawa, H; Mitsuma, Y; Ebihara, Y; Miyake, F

ASTROPHYSICAL JOURNAL LETTERS 884 巻 ( 1 ) 2019年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal Letters

Auroral records found in historical archives and cosmogenic isotopes found in natural archives have served as sound proxies of coronal mass ejections and solar energetic particles (SEPs), respectively, for dates prior to the onset of telescopic sunspot observations in 1610. These space weather events constitute a significant threat to a modern civilization, because of its increasing dependency on an electronic infrastructure. Recent studies have identified multiple extreme space weather events derived from SEPs in natural archives, such as the event in 660 BCE. While the level of solar activity around 660 BCE is of great interest, this had not been within the coverage of the hitherto-known datable auroral records in historical documents that extend back to the 6th century BCE. Therefore, we have examined Assyrian astrological reports in the 8th and 7th centuries BCE, identified three observational reports of candidate aurorae, and dated these reports to approximately 680 BCE-650 BCE. The Assyrian cuneiform tablets let us extend the history of auroral records and solar activity by a century. These cuneiform reports are considered to be the earliest datable records of candidate aurorae and they support the concept of enhanced solar activity suggested by the cosmogenic isotopes from natural archives.

DOI： 10.3847/2041-8213/ab42e4

Web of Science

Scopus

Cosmogenic Evidence for Past SEP Events 国際誌

MIYAKE Fusa

Proc. 36th International Cosmic Ray Conference 2019年8月

過去3000年間の宇宙線強度年変動国際誌

三宅芙沙, 増田公明, 中村俊夫, 箱﨑真隆, 木村勝彦, 門叶冬樹, 森谷透, 武山美麗, Jull T, Panyushkina I

第20回AMSシンポジウム報告集頁： 83 - 86 2019年2月

The measurement of ion-induced cloud nucleation irradiated with a 180-MeV nitrogen ion and proton beams at HIMAC accelerator facility 国際誌

Suzuki A., Itow Y., Sako T., Nakayama T., Masuda K., Miyake F., Matsumi Y., Miura K., Kusano K.

Proceedings of Science 358 巻 2019年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

Ion-induced nucleation by cosmic rays influenced by solar modulation is of interest, and several studies with radioactive sources or accelerator beams have been performed. We focused on ionization with high-linear energy transfer (LET) particles, such as protons, neutrons, and ions, in secondary cosmic rays and the ion density of the secondary cosmic rays near the ground using the excel-based program for calculating atmospheric cosmic-ray spectrum (EXPACS). According to the calculation, not only muons but also protons and neutrons leave substantial traces of solar modulation at an altitude of 3 km from the ground. To verify the ion-induced nucleation by these secondary high-LET cosmic rays, a chamber experiment was conducted at the accelerator facility HIMAC. Using a chamber with a capacity of 75 L, experiments were conducted by irradiating protons and nitrogen ion beams with a constant energy of 180 MeV/u with varying intensity. The experimental results confirm that the ion density and aerosol density increased as the beam intensity increased. The aerosol density was found to be proportional to the ion density, but irrelevant to the ionization density. It was concluded that the ion-induced nucleation by high-LET secondary cosmic rays, such as protons and neutrons, provides no evidence of enhancement owing to ionization density and cannot account for the claimed variation of cloud formation due to the solar modulation.

Scopus

Cosmogenic evidence for past SEP events 国際誌

Miyake F.

Proceedings of Science 358 巻 2019年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Proceedings of Science

Scopus

Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE (vol 9, 3605, 2018) 査読有り国際誌

Büntgen, U; Wacker, L; Galvan, JD; Arnold, S; Arseneault, D; Baillie, M; Beer, J; Bernabei, M; Bleicher, N; Boswijk, G; Bräuning, A; Carrer, M; Ljungqvist, FC; Cherubini, P; Christl, M; Christie, DA; Clark, PW; Cook, ER; D'Arrigo, R; Davi, N; Eggertsson, O; Esper, J; Fowler, AM; Gedalof, Z; Gennaretti, F; Griessinger, J; Grissino-Mayer, H; Grudd, H; Gunnarson, BE; Hantemirov, R; Herzig, F; Hessl, A; Heussner, KU; Jull, AJT; Kukarskih, V; Kirdyanov, A; Kolár, T; Krusic, PJ; Kyncl, T; Lara, A; LeQuesne, C; Linderholm, HW; Loader, NJ; Luckman, B; Miyake, F; Myglan, VS; Nicolussi, K; Oppenheimer, C; Palmer, J; Panyushkina, I; Pederson, N; Rybnícek, M; Schweingruber, FH; Seim, A; Sigl, M; Churakova, O; Speer, JH; Synal, HA; Tegel, W; Treydte, K; Villalba, R; Wiles, G; Wilson, R; Winship, LJ; Wunder, J; Yang, B; Young, GHF

NATURE COMMUNICATIONS 9 巻 ( 1 ) 頁： 5399 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nature Communications

The original version of this Article contained an error in the Data Availability section, which incorrectly read ‘All data will be freely available via https://www.ams.ethz.ch/research.html.’ The correct version states ‘http://www.ams.ethz.ch/research/published-data.html’ in place of ‘https://www.ams.ethz.ch/research.html’. This has been corrected in both the PDF and HTML versions of the Article.

DOI： 10.1038/s41467-018-07636-6

Web of Science

Scopus

PubMed

14Cスパイク法によるB-Tmテフラの精密年代と相関係数マッチング法の検討国際誌

奥野充, 八塚槙也, 木村勝彦, 坂本稔, 箱﨑真隆, 洪完, 三宅芙沙, 増田公明, 中村俊夫

国際火山噴火史情報研究集会講演要旨集2018-1 頁： 50 - 54 2018年7月

日本産樹木年輪の14Cオフセット国際誌

中村俊夫, 増田公明, 三宅芙沙, 箱﨑真隆, 奥野充

国際火山噴火史情報研究集会講演要旨集2018-1 頁： 31 - 41 2018年7月

MORE RAPID <SUP>14</SUP>C EXCURSIONS IN THE TREE-RING RECORD: A RECORD OF DIFFERENT KIND OF SOLAR ACTIVITY AT ABOUT 800 BC? 査読有り国際誌

Jull, AJT; Panyushkina, I; Miyake, F; Masuda, K; Nakamura, T; Mitsutani, T; Lange, TE; Cruz, RJ; Baisan, C; Janovics, R; Varga, T; Molnár, M

RADIOCARBON 60 巻 ( 4 ) 頁： 1237 - 1248 2018年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Radiocarbon

Two radiocarbon (14C) excursions are caused by an increase of incoming cosmic rays on a short time scale found in the Late Holocene (AD 774-775 and AD 993-994), which are widely explained as due to extreme solar proton events (SPE). In addition, a larger event has also been reported at 5480 BC (Miyake et al. 2017a), which is attributed to a special mode of a grand solar minimum, as well as another at 660 BC (Park et al. 2017). Clearly, other events must exist, but could have different causes. In order to detect more such possible events, we have identified periods when the 14C increase rate is rapid and large in the international radiocarbon calibration (IntCal) data (Reimer et al. 2013). In this paper, we follow on from previous studies and identify a possible excursion starting at 814-813 BC, which may be connected to the beginning of a grand solar minimum associated with the beginning of the Hallstatt period, which is characterized by relatively constant 14C ages in the period from 800-400 BC. We compare results of annual 14C measurements from tree rings of sequoia (California) and cedar (Japan), and compare these results to other identified excursions, as well as geomagnetic data. We note that the structure of the increase from 813 BC is similar to the increase at 5480 BC, suggesting a related origin. We also assess whether there are different kinds of events that may be observed and may be consistent with different types of solar phenomena, or other explanations.

DOI： 10.1017/RDC.2018.53

Web of Science

Scopus

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