Faculty Profiles - MIYAKE Fusa

Papers - MIYAKE Fusa

Division display 41 - 58 of about 58 ／ All the affair displays >>

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

Asami Suzuki, Yoshitaka Itow, Takashi Sako, Tomoki Nakayama, Kimiaki Masuda, Fusa Miyake, Yutaka Matsumi, Kazuhiko Miura, Kanya Kusano

Proceedings of Science Vol. 358 2019

Language：English Publishing type：Research paper (international conference proceedings)

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

Author Correction: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE. Reviewed International journal Open Access

Büntgen U, Wacker L, Galván 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 Ó, 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, Kolář 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, Rybníček M, Schweingruber FH, Seim A, Sigl M, Churakova Sidorova 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 Vol. 9 ( 1 ) page： 5399 2018.12

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 International journal

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 page： 50 - 54 2018.7

日本産樹木年輪の14Cオフセット International journal

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 page： 31 - 41 2018.7

MORE RAPID C-14 EXCURSIONS IN THE TREE-RING RECORD: A RECORD OF DIFFERENT KIND OF SOLAR ACTIVITY AT ABOUT 800 BC? Reviewed International journal Open Access

Jull A. J. Timothy, Panyushkina Irina, Miyake Fusa, Masuda Kimiaki, Nakamura Toshio, Mitsutani Takumi, Lange Todd E, Cruz Richard J, Baisan Chris, Janovics Robert, Varga Tamas, Molnar Mihaly

RADIOCARBON Vol. 60 ( 4 ) page： 1237 - 1248 2018.6

Language：English Publishing type：Research paper (scientific journal) Publisher：UNIV ARIZONA DEPT GEOSCIENCES

Two radiocarbon (C-14) 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 C-14 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 C-14 ages in the period from 800-400 BC. We compare results of annual C-14 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

Verification of the annual dating of the 10th century Baitoushan volcano eruption based on an 774-775 radiocarbon spike Reviewed International journal

M. Hakozaki, F. Miyake, T. Nakamura, K. Kimura, K. Masuda, M. Okuno

Radiocarbon Vol. 60 ( 1 ) page： 261 - 268 2018.2

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：UNIV ARIZONA DEPT GEOSCIENCES

The so-called Millennium Eruption of Baitoushan Volcano is one of the largest of the Common Era but its date has been uncertain. Recently, Oppenheimer et al. (2017) reported the eruptive year as late AD 946 using a new method called carbon-14 spike matching. However, it is necessary to verify their result to confirm the eruptive year, since only one wood sample was used in their study. We verified the eruptive year by measuring C-14 contents in tree rings from another wood sample buried during the Baitoushan eruption. We succeeded in reproducing the AD 774-775 C-14 spike (Miyake et al. 2012), and counted the number of rings from the outermost ring accompanied by bark to the ring possessing the AD 774-775 C-14 spike. We found the outermost ring was formed in AD 946. Our study supported the result of Oppenheimer et al. (2017), which makes the eruptive year conclusive. Also, we suggest that the C-14 spike-matching method can be a prominent dating tool applicable to ancient woods that are difficult to date using the usual dendrochronology techniques.

DOI： 10.1017/RDC.2017.75

Web of Science

Scopus

Study for elucidation of the 5480 BC cosmic ray event using cosmogenic nuclides 10Be and 36Cl.

Takano Kenta, Sasa Kimikazu, Takahashi Tsutomu, Matsumura Masumi, Ochiai Yuta, Sueki Keisuke, Miyake Fusa, Horiuchi Kazuho, Matsuzaki Hiroyuki

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 65 ( 0 ) page： 230 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：GEOCHEMICAL SOCIETY OF JAPAN

Recently, the increase of cosmic ray flux was found around 5480 BC using the 14C measurements for tree rings with 1- to 2-y resolution. It is assumed that it may be caused by the large solar flares but we cannot specify the detail cause of this event. In this study, we aim to elucidate the cause of 5480 BC cosmic ray event by measuring 10Be and 36Cl in the ice core which was drilled at the Dome Fuji Station in Antarctica, and investigate the variation of cosmic ray flux around 5480 BC. The result of 36Cl concentration variation using the Accelerator Mass Spectrometry (AMS) system in the University of Tsukuba is reported in this presentation. In addition, the performance of 10Be-AMS and the future plan is also presented.

DOI： 10.14862/geochemproc.65.0_230

CiNii Research

白頭山10世紀噴火のAD775 14C-spikeおよび酸素同位体比年輪年代測定に基づく年代検証 International journal

箱﨑真隆, 三宅芙沙, 中村俊夫, 木村勝彦, 佐野雅規, 對馬あかね, 李貞, 中塚武, 増田公明, 奥野充

Korea-Japan dendrochronology workshop toward a new phase of archeology page： 22 - 22 2017.8

樹木年輪と単年宇宙線イベント Invited International journal

三宅芙沙, 増田公明, 中村俊夫, 箱崎真隆, 木村勝彦, I P Panyushkina・A J, T Ju

第19回AMSシンポジウム・2016年度「樹木年輪」研究会共同開催シンポジウム報告集 page： 12 - 15 2017.6

SUPERNOVAE AND SINGLE-YEAR ANOMALIES IN THE ATMOSPHERIC RADIOCARBON RECORD Reviewed International journal Open Access

Michael Dee, Benjamin Pope, Daniel Miles, Sturt Manning, Fusa Miyake

RADIOCARBON Vol. 59 ( 2 ) page： 293 - 302 2017.4

Language：English Publishing type：Research paper (scientific journal) Publisher：UNIV ARIZONA DEPT GEOSCIENCES

Single-year spikes in radiocarbon production are caused by intense bursts of radiation from space. Supernovae emit both high-energy particle and electromagnetic radiation, but it is the latter that is most likely to strike the atmosphere all at once and cause a surge in C-14 production. In the 1990s, it was claimed that the supernova in 1006 CE produced exactly this effect. With the C-14 spikes in the years 775 and 994 CE now attributed to extreme solar events, attention has returned to the question of whether historical supernovae are indeed detectable using annual C-14 measurements. Here, we combine new and existing measurements over six documented and putative supernovae, and conclude that no such astrophysical event has yet left a distinct imprint on the past atmospheric C-14 record.

DOI： 10.1017/RDC.2016.50

Web of Science

Scopus

Atmospheric impacts of the strongest known solar particle storm of 775 AD Reviewed International journal Open Access

Timofei Sukhodolov, Ilya Usoskin, Eugene Rozanov, Eleanna Asvestari, William T. Ball, Mark A. J. Curran, Hubertus Fischer, Gennady Kovaltsov, Fusa Miyake, Thomas Peter, Christopher Plummer, Werner Schmutz, Mirko Severi, Rita Traversi

SCIENTIFIC REPORTS Vol. 7 page： 45257 2017.3

Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP

Sporadic solar energetic particle (SEP) events affect the Earth's atmosphere and environment, in particular leading to depletion of the protective ozone layer in the Earth's atmosphere, and pose potential technological and even life hazards. The greatest SEP storm known for the last 11 millennia (the Holocene) occurred in 774-775 AD, serving as a likely worst-case scenario being 40-50 times stronger than any directly observed one. Here we present a systematic analysis of the impact such an extreme event can have on the Earth's atmosphere. Using state-of-the-art cosmic ray cascade and chemistry-climate models, we successfully reproduce the observed variability of cosmogenic isotope Be-10, around 775 AD, in four ice cores from Greenland and Antarctica, thereby validating the models in the assessment of this event. We add to prior conclusions that any nitrate deposition signal from SEP events remains too weak to be detected in ice cores by showing that, even for such an extreme solar storm and sub-annual data resolution, the nitrate deposition signal is indistinguishable from the seasonal cycle. We show that such a severe event is able to perturb the polar stratosphere for at least one year, leading to regional changes in the surface temperature during northern hemisphere winters.

DOI： 10.1038/srep45257

High-precision age determination of Holocene samples by radiocarbon dating with accelerator mass spectrometry at Nagoya University

T. Nakamura, K. Masuda, F. Miyake, M. Hakozaki, K. Kimura, H. Nishimoto, E. Hitoki

Quaternary International 2015

Cosmic ray event of A.D. 774-775 shown in quasi-annual 10Be data from the Antarctic Dome Fuji ice core

F. Miyake, A. Suzuki, K. Masuda, K. Horiuchi, H. Motoyama, H. Matsuzaki, Y. Motizuki, K. Takahashi, Y. Nakai

Geophys. Res. Lett. 2015

屋久杉に刻まれた宇宙現象

三宅芙沙,増田公明

物理学会誌 Vol. 69 ( 2 ) page： 93-97 2014

Verification of the cosmic ray event in AD 993-994 by using a Japanese Hinoki tree

F. Miyake, K. Masuda, M. Hakozaki, T. Nakamura, F. Tokanai, K. Kato, K. Kimura, and T. Mitsutani

Radiocarbon 2014

Radiocarbon ages of annual rings from Japanese wood: Evident age offset based on IntCal09

T. Nakamura, K. Masuda, F. Miyake, K. Nagaya, T. Yoshimitsu

Radiocarbon page： 763-770 2013

Lengths of Schwabe cycles in the 7th and 8th centuries indicated by precise measurement of carbon-14 content in tree rings

F. Miyake, K. Masuda, T. Nakamura

J. Geophys. Res. 2013

Variation of the Schwabe Cycle Length During the Grand Solar Minimum in the 4th Century BC Deduced from Radiocarbon Content in Tree Rings

K. Nagaya, K. Kitazawa, F. Miyake, K. Masuda, Y. Muraki, T. Nakamura, H. Miyahara, H. Matsuzaki

Solar Physics page： 232-236 2012

　 PREV - NEXT 　

<MIYAKE Fusa>

Papers - MIYAKE Fusa