Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT
文献类型：期刊论文
| 作者 | Acharyya, A.29; Adelfio, A.50; Ajello, M.51; Baldini, L.52,53; Bartolini, C.54,55; Bastieri, D.56,57,58; Gonzalez, J. Becerra59; Bellazzini, R.53; Berenji, B.60; Bissaldi, E.54,62 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2025-08-10 |
| 卷号 | 989期号:1 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/adef4d |
| 产权排序 | 第37完成单位 |
| 文献子类 | Article |
| 英文摘要 | The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and (2) a leptonic extended component peaking at the solar edge and extending into the heliosphere. The flux of these components is expected to vary with the 11 yr solar cycle, being highest during solar minimum and lowest during solar maximum, as it varies with the cosmic-ray flux. No study has yet analyzed the flux variation of each component over solar cycles. In this work, we measure the temporal variations of the flux of each component over 15 yr of Fermi Large Area Telescope observations and compare them with the sunspot number and Galactic cosmic-ray flux from AMS-02 near Earth. We find that the flux variation of the disk anticorrelates with the sunspot number and correlates with cosmic-ray protons, as expected, confirming its emission mechanism. In contrast, the extended component exhibits a more complex variation: despite an initial anticorrelation with the sunspot number, we find neither anticorrelation with the sunspot number nor correlation with cosmic-ray electrons over the full 15 yr period. This most likely suggests that cosmic-ray transport and modulation in the inner heliosphere are unexpectedly complex and may differ for electrons and protons or, alternatively, that there is an additional, unknown component of gamma rays or cosmic rays. These findings impact space weather research and emphasize the need for close monitoring of Cycle 25 and the ongoing polarity reversal. |
| 学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | LARGE-AREA TELESCOPE ; HELIOSPHERIC MODULATION ; EMISSION ; ELECTRONS ; PERIOD |
| 资助项目 | National Aeronautics and Space Administration; Department of Energy in the United States; Commissariat a l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France; Agenzia Spaziale Italiana; Istituto Nazionale di Fisica Nucleare in Italy; Ministry of Education, Culture, Sports, Science and Technology (MEXT); K. A. Wallenberg Foundation; Swedish Research Council; Swedish National Space Board in Sweden; Istituto Nazionale di Astrofisica in Italy; Centre National d'Etudes Spatiales in France; DOE[DE-AC02-76SF00515]; NASA[80NSSC20K1558]; NASA[80NSSC22K0495]; ORCID iDs A. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001573791700001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Aeronautics and Space Administration ; Department of Energy in the United States ; Commissariat a l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France ; Agenzia Spaziale Italiana ; Istituto Nazionale di Fisica Nucleare in Italy ; Ministry of Education, Culture, Sports, Science and Technology (MEXT) ; K. A. Wallenberg Foundation ; Swedish Research Council ; Swedish National Space Board in Sweden ; Istituto Nazionale di Astrofisica in Italy ; Centre National d'Etudes Spatiales in France ; DOE[DE-AC02-76SF00515] ; NASA[80NSSC20K1558, 80NSSC22K0495] ; ORCID iDs A. |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28730]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Giglietto, N. |
| 作者单位 | 1.Institut für Theoretische Physik and Astrophysik, Universität Würzburg, D-97074 Würzburg, Germany; 2.INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via E. Bassini 15, I-20133 Milano, Italy; 3.Istituto Nazionale di Fisica Nucleare, Sezione di Roma “Tor Vergata,” I-00133 Roma, Italy; 4.Space Science Data Center - Agenzia Spaziale Italiana, Via del Politecnico, snc, I-00133, Roma, Italy; 5.Dipartimento di Fisica, Università La Sapienza, Piazzale A. Moro, 2, I-00185 Roma, Italy; 6.Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy; 7.Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy; 8.Dipartimento di Fisica dell’Università di Trento, via Sommarive, 14, Povo (TN), I-38123, Italy; 9.Institute of Astrophysics, Foundation for Research and Technology-Hellas, Heraklion, GR-70013, Greece; 10.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Acharyya, A.,Adelfio, A.,Ajello, M.,et al. Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,989(1). |
| APA | Acharyya, A..,Adelfio, A..,Ajello, M..,Baldini, L..,Bartolini, C..,...&Zhang, W..(2025).Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT.ASTROPHYSICAL JOURNAL LETTERS,989(1). |
| MLA | Acharyya, A.,et al."Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT".ASTROPHYSICAL JOURNAL LETTERS 989.1(2025). |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。