| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-12-26 |
| タイトル |
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タイトル |
XRISM observations of solar flare X-ray emission reflected in the Earth’s atmosphere |
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言語 |
en |
| 言語 |
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言語 |
eng |
| キーワード |
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言語 |
en |
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キーワード |
Sun: abundances |
| キーワード |
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言語 |
en |
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キーワード |
Sun: corona |
| キーワード |
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言語 |
en |
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キーワード |
Sun: flares |
| キーワード |
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言語 |
en |
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キーワード |
Sun: X-rays, gamma rays |
| 資源タイプ |
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資源タイプ |
journal article |
| アクセス権 |
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アクセス権 |
open access |
| 著者 |
鈴木, 寛大
WEKO
35601
e-Rad_Researcher
50915402
| ja |
鈴木, 寛大
宮崎大学
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| ja-Kana |
スズキ, ヒロマサ
|
| en |
Suzuki, Hiromasa
University of Miyazaki
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Search repository
Kurashima, Jun
Katsuda, Satoru
森, 浩二
Inoue, Shun
Ishi, Daiki
| en |
Ishi, Daiki（Personal）
JAXA Institute of Space and Astronautical Science
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Search repository
Churazov, Eugene M.
| en |
Churazov, Eugene M.（Personal）
Max Planck Institute for Astrophysics
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Search repository
Khabibullin, Ildar
| en |
Khabibullin, Ildar（Personal）
Max Planck Institute for Astrophysics
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Search repository
Sunyaev, Rashid A.
| en |
Sunyaev, Rashid A.（Personal）
Max Planck Institute for Astrophysics
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Search repository
Mizuno, Tsunefumi
Kilbourne, Caroline
Ezoe, Yuichiro
Nakajima, Hiroshi
Sato, Kosuke
| en |
Sato, Kosuke（Personal）
International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles ( QUP)
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Search repository
Miller, Eric
| en |
Miller, Eric（Personal）
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology
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Search repository
Matsushita, Kyoko
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
The X-ray Imaging and Spectroscopy Mission (XRISM), launched into low-Earth orbit in 2023, observes the reflection of solar flare X-rays in the Earth’s atmosphere as a by-product of celestial observations. Using a ∼1 yr data set covering 2023 October–2024 November, we report on our first results of the measurement of the metal abundance pattern and high-resolution Fe K spectroscopy. The abundances of Mg, Si, S, Ar, Ca, and Fe measured with the CCD detector Xtend during M- and X-class flares show the inverse-first-ionization-potential (inverse-FIP) effect, which is consistent with the results of Katsuda et al. (2020, ApJ, 891, 126) using the Suzaku satellite. The abundances of Si, S, and Ar are found to decrease with increasing flare magnitude, which is consistent with the theoretical model by Laming (2021, ApJ, 909, 17), whereas Ca exhibits an opposite trend. The large effective area and field of view of Xtend allow us to trace the evolution of the abundances in several X-class flare loops on a timescale of a few 100 s, finding an enrichment of low-FIP elements before flare peaks. The high-resolution Fe K spectrum obtained with the microcalorimeter Resolve successfully separates the Rayleigh- and Compton-scattered Fe XXIV/XXV lines and neutral or low-ionized Fe Kα lines. The neutral/low-ionized Fe Kα equivalent width shows an anti-correlation with hard X-ray flux with a best-fitting power-law slope of −0.14 ± 0.09, suggesting that hard X-rays from flare loops are stimulating the Fe Kα fluorescence. This work demonstrates that XRISM can be a powerful tool in the field of solar physics, offering valuable high-statistic CCD data and high-resolution microcalorimeter spectra in the energy range extending to the Fe K band. |
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言語 |
en |
| 書誌情報 |
en : Publications of the Astronomical Society of Japan
巻 77,
号 6,
p. 1301-1312,
発行日 2025-12-01
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| 出版者 |
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出版者 |
Oxford University Press |
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言語 |
en |
| ISSN |
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収録物識別子タイプ |
EISSN |
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収録物識別子 |
2053051X |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
00046264 |
| DOI |
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関連タイプ |
isVersionOf |
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識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1093/pasj/psaf108 |
| 権利 |
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権利情報 |
© The Author(s) 2025. Published by Oxford University Press on behalf of the Astronomical Society of Japan. |
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言語 |
en |
| 著者版フラグ |
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出版タイプ |
VoR |
Fulltext (5.2 MB)
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