Energetic Electrons Accelerated and Trapped in a Magnetic Bottle above a Solar Flare Arcade
Bin Chen (1), Xiangliang Kong (2), Sijie Yu (1), Chengcai Shen (3),, Xiaocan Li (4), Fan Guo (5), Yixian Zhang (6), Lindsay Glesener (6), S\"am, Krucker (7, 8) ((1) New Jersey Institute of Technology, (2) Shandong, University, (3) Harvard-Smithsonian Center for Astrophysics

TL;DR
This study combines multiwavelength observations with modeling to demonstrate that magnetic bottle structures above solar flare arcades are key sites for trapping and accelerating energetic electrons, advancing understanding of particle acceleration in solar flares.
Contribution
It provides the first integrated observational and modeling evidence linking magnetic bottle structures to electron acceleration in eruptive solar flares.
Findings
Magnetic bottle structures are supported by observations including magnetic field minima and plasma slowing.
Nonthermal electrons are highly concentrated in the magnetic bottle region.
Electrons are accelerated mainly by plasma compression and a fast-mode shock via Fermi acceleration.
Abstract
Where and how flares efficiently accelerate charged particles remains an unresolved question. Recent studies revealed that a "magnetic bottle" structure, which forms near the bottom of a large-scale reconnection current sheet above the flare arcade, is an excellent candidate for confining and accelerating charged particles. However, further understanding its role requires linking the various observational signatures to the underlying coupled plasma and particle processes. Here we present the first study combining multiwavelength observations with data-informed macroscopic magnetohydrodynamics and particle modeling in a realistic eruptive flare geometry. The presence of an above-the-loop-top magnetic bottle structure is strongly supported by the observations, which feature not only a local minimum of magnetic field strength but also abruptly slowing down plasma downflows. It also…
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Taxonomy
TopicsSolar and Space Plasma Dynamics
