Dynamical Modulation of Solar Flare Electron Acceleration due to Plasmoid-shock Interactions in the Looptop Region

Kong, Xiangliang; Guo, Fan; Shen, Chengcai; Chen, Bin; Chen, Yao; Giacalone, Joe

doi:10.3847/2041-8213/abcbf5

Title: Dynamical Modulation of Solar Flare Electron Acceleration due to Plasmoid-shock Interactions in the Looptop Region

Journal Article · Wed Dec 16 00:00:00 EST 2020 · The Astrophysical Journal. Letters (Online)

DOI:https://doi.org/10.3847/2041-8213/abcbf5· OSTI ID:1807850

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^[1]; Giacalone, Joe ^[5]

Shandong Univ., Jinan (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
New Jersey Institute of Technology, Newark, NJ (United States)
Univ. of Arizona, Tucson, AZ (United States)

A fast-mode shock can form in the front of reconnection outflows and has been suggested as a promising site for particle acceleration in solar flares. Recent developments in the study of magnetic reconnection have shown that numerous plasmoids can be produced in a large-scale current layer. Here we investigate the dynamical modulation of electron acceleration in the looptop region when plasmoids intermittently arrive at the shock by combining magnetohydrodynamics simulations with a particle kinetic model. As plasmoids interact with the shock, the looptop region exhibits various compressible structures that modulate the production of energetic electrons. The energetic electron population varies rapidly in both time and space. The number of 5–10 keV electrons correlates well with the compression area, while that of >50 keV electrons shows good correlation with the strong compression area but only moderate correlation with shock parameters. We further examine the impacts of the first plasmoid, which marks the transition from a quasi-steady shock front to a distorted and dynamical shock. The number of energetic electrons is reduced by ~20% at 15–25 keV and nearly 40% for 25–50 keV, while the number of 5–10 keV electrons increases. In addition, the electron energy spectrum above 10 keV evolves softer with time. We also find that double or even multiple distinct sources can develop in the looptop region when the plasmoids move across the shock. Our simulations have strong implications to the interpretation of nonthermal looptop sources, as well as the commonly observed fast temporal variations in flare emissions, including the quasi-periodic pulsations.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; SC0018240; 11873036; 42074203; 11790303; 11790300; AST-1735414; AST-1735405; AST-1735525; AGS-1723313; AGS-1723425; 1735422

OSTI ID:: 1807850

Report Number(s):: LA-UR-20-30072; TRN: US2212845

Journal Information:: The Astrophysical Journal. Letters (Online), Vol. 905, Issue 2; ISSN 2041-8213

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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