Particle Acceleration at the Pileup Collision of the Twin Shock

doi:10.3847/1538-4357/ab4655

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	Particle Acceleration at the Pileup Collision of the Twin Shock
	Wang,Xin 1,2,3,4,6; Giacalone,Joe 1; Yan,Yihua 6; Ding,Mingde 4; Li,Chuan 4; Lu,Hong 5; Shan,Hao 2,3
刊名	The Astrophysical Journal
	2019-10-31
卷号	885 期号:1 页码:66
关键词	acceleration of particles shock waves solar wind Sun: coronal mass ejections (CMEs)
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab4655
产权排序	1
英文摘要	Abstract Ground-level enhancement (GLE) events are often associated with large gradual solar events such as fast coronal mass ejections (CMEs), but not all fast CMEs lead to GLE events. Is there a type of coordinated CME that could produce GLEs with larger intensity and higher energies than those in the normal fast isolated CMEs? Here we propose a twin-shock scenario driven by the twin CME coordinately, in which the posterior shock catches up with the preceding shock and has a pileup collision. In the present study, we chose the first GLE event of the solar cycle 24 occurring on 2012 May 17 as an example to investigate the probable association with the twin-shock scenario. We use a dynamic Monte Carlo method to examine the energy spectrum with relevance to the GLE event. In the twin-shock scenario, the seed energetic particles produced by the normal preceding shock can be injected into the posterior shock for reacceleration efficiently. As a result, we obtain the detailed energy spectrum of the solar energetic particles (SEPs) with different behaviors at the related episodes of the twin-shock evolution. Therefore, we predict that the pileup collision of the twin shock would dominate a concave energy spectral slope in the 2012 May 17 SEP event.
语种	英语
出版者	The American Astronomical Society
WOS记录号	WOS:000498641700002
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3219]
专题	太阳物理研究室_太阳物理研究团组
通讯作者	Wang,Xin
作者单位	1.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA 2.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China 3.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, People’s Republic of China; wangxin@xao.ac.cn 4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, People’s Republic of China 5.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 6.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, People’s Republic of China
推荐引用方式 GB/T 7714	Wang,Xin,Giacalone,Joe,Yan,Yihua,et al. Particle Acceleration at the Pileup Collision of the Twin Shock[J]. The Astrophysical Journal,2019,885(1):66.
APA	Wang,Xin.,Giacalone,Joe.,Yan,Yihua.,Ding,Mingde.,Li,Chuan.,...&Shan,Hao.(2019).Particle Acceleration at the Pileup Collision of the Twin Shock.The Astrophysical Journal,885(1),66.
MLA	Wang,Xin,et al."Particle Acceleration at the Pileup Collision of the Twin Shock".The Astrophysical Journal 885.1(2019):66.