Particle Acceleration in Two Converging Shocks?*This work is supported by the Xinjiang Natural Science Foundation No. 2014211A069.
文献类型：期刊论文
| 作者 | Wang,Xin1,2,3,4,5; Giacalone,Joe3; Yan,Yihua4; Ding,Mingde5; Wang,Na1,2; Shan,Hao1,2 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-06-15 |
| 卷号 | 842期号:2 |
| 关键词 | acceleration of particles methods: numerical scattering shock waves Sun: coronal mass ejections (CMEs) turbulence |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa750f |
| 英文摘要 | Abstract Observations by spacecraft such as ACE, STEREO, and others show that there are proton spectral “breaks” with energy Ebr at 1–10 MeV in some large CME-driven shocks. Generally, a single shock with the diffusive acceleration mechanism would not predict the “broken” energy spectrum. The present paper focuses on two converging shocks to identify this energy spectral feature. In this case, the converging shocks comprise one forward CME-driven shock on 2006 December 13 and another backward Earth bow shock. We simulate the detailed particle acceleration processes in the region of the converging shocks using the Monte Carlo method. As a result, we not only obtain an extended energy spectrum with an energy “tail” up to a few 10 MeV higher than that in previous single shock model, but also we find an energy spectral “break” occurring on ～5.5 MeV. The predicted energy spectral shape is consistent with observations from multiple spacecraft. The spectral “break,” then, in this case is caused by the interaction between the CME shock and Earth’s bow shock, and otherwise would not be present if Earth were not in the path of the CME. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-842-2-AA750F |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35987]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China 2.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China; wangxin@xao.ac.cn 3.Lunar and Planetary Laboratory, University of Arizona, Tucson AZ 85721, USA 4.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, China 5.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education, Nanjing 210093, China |
| 推荐引用方式 GB/T 7714 | Wang,Xin,Giacalone,Joe,Yan,Yihua,et al. Particle Acceleration in Two Converging Shocks?*This work is supported by the Xinjiang Natural Science Foundation No. 2014211A069.[J]. The Astrophysical Journal,2017,842(2). |
| APA | Wang,Xin,Giacalone,Joe,Yan,Yihua,Ding,Mingde,Wang,Na,&Shan,Hao.(2017).Particle Acceleration in Two Converging Shocks?*This work is supported by the Xinjiang Natural Science Foundation No. 2014211A069..The Astrophysical Journal,842(2). |
| MLA | Wang,Xin,et al."Particle Acceleration in Two Converging Shocks?*This work is supported by the Xinjiang Natural Science Foundation No. 2014211A069.".The Astrophysical Journal 842.2(2017). |
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来源：国家天文台
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