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Particle Acceleration at the Pileup Collision of the Twin Shock
Wang,Xin1,2,3,4,5; Giacalone,Joe2; Yan,Yihua3; Ding,Mingde4; Li,Chuan4; Lu,Hong6; Shan,Hao1,5
2019-10-31
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume885Issue:1
AbstractAbstract 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.
Keywordacceleration of particles shock waves solar wind Sun: coronal mass ejections (CMEs)
DOI10.3847/1538-4357/ab4655
Language英语
WOS IDIOP:0004-637X-885-1-ab4655
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28442
Collection中国科学院国家天文台
Affiliation1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, People’s Republic of China; wangxin@xao.ac.cn
2.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
3.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, People’s Republic of China
4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, People’s Republic of China
5.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China
6.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Recommended Citation
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).
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).
MLA Wang,Xin,et al."Particle Acceleration at the Pileup Collision of the Twin Shock".The Astrophysical Journal 885.1(2019).
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