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The Acceleration and Confinement of Energetic Electrons by a Termination Shock in a Magnetic Trap: An Explanation for Nonthermal Loop-top Sources during Solar Flares
Alternative TitleWOS:000518385900010
Kong, Xiangliang1,2; Guo, Fan3,4; Shen, Chengcai5; Chen, Bin6; Chen, Yao; Musset, Sophie7; Glesener, Lindsay7; Pongkitiwanichakul, Peera8; Giacalone, Joe9
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2019
Volume887Issue:2Pages:L37
DOI10.3847/2041-8213/ab5f67
ISSN2041-8205
Language英语
KeywordX-RAY SOURCE PARTICLE-ACCELERATION MAGNETOHYDRODYNAMIC SIMULATION CHROMOSPHERIC EVAPORATION COSMIC-RAYS RECONNECTION HARD
AbstractNonthermal loop-top sources in solar flares are the most prominent observational signatures that suggest energy release and particle acceleration in the solar corona. Although several scenarios for particle acceleration have been proposed, the origin of the loop-top sources remains unclear. Here we present a model that combines a large-scale magnetohydrodynamic simulation of a two-ribbon flare with a particle acceleration and transport model for investigating electron acceleration by a fast-mode termination shock (TS) at the loop top. Our model provides spatially resolved electron distribution that evolves in response to the dynamic flare geometry. We find a concave-downward magnetic structure located below the flare TS, induced by the fast reconnection downflows. It acts as a magnetic trap to confine the electrons at the loop top for an extended period of time. The electrons are energized significantly as they cross the shock front, and eventually build up a power-law energy spectrum extending to hundreds of kiloelectron volts. We suggest that this particle acceleration and transport scenario driven by a flare TS is a viable interpretation for the observed nonthermal loop-top sources.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7635
Collection中国科学院国家空间科学中心
Affiliation1.Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China
2.Shandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
3.Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China
4.Los Alamos Natl Lab, Los Alamos, NM 87545 USA
5.New Mexico Consortium, 4200 West Jemez Rd, Los Alamos, NM 87544 USA
6.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
7.New Jersey Inst Technol, Ctr Solar Terr Res, 323 Dr Martin Luther King Blvd, Newark, NJ 07102 USA
8.Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
9.Kasetsart Univ, Dept Phys, Fac Sci, Bangkok 10900, Thailand
10.Univ Arizona, Dept Planetary Sci, Tucson, AZ 85721 USA
Recommended Citation
GB/T 7714
Kong, Xiangliang,Guo, Fan,Shen, Chengcai,et al. The Acceleration and Confinement of Energetic Electrons by a Termination Shock in a Magnetic Trap: An Explanation for Nonthermal Loop-top Sources during Solar Flares[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,887(2):L37.
APA Kong, Xiangliang.,Guo, Fan.,Shen, Chengcai.,Chen, Bin.,Chen, Yao.,...&Giacalone, Joe.(2019).The Acceleration and Confinement of Energetic Electrons by a Termination Shock in a Magnetic Trap: An Explanation for Nonthermal Loop-top Sources during Solar Flares.ASTROPHYSICAL JOURNAL LETTERS,887(2),L37.
MLA Kong, Xiangliang,et al."The Acceleration and Confinement of Energetic Electrons by a Termination Shock in a Magnetic Trap: An Explanation for Nonthermal Loop-top Sources during Solar Flares".ASTROPHYSICAL JOURNAL LETTERS 887.2(2019):L37.
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