Fermi acceleration in plasmoids interacting with fast shocks of reconnection via fractal reconnection

We propose the particle acceleration model coupled with multiple plasmoid ejections in a solar flare. Unsteady reconnection produces plasmoids in a current sheet and ejects them out to the fast shocks, where particles in a plasmoid are reflected upstream the shock front by magnetic mirror effect. As...

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Bibliographic Details
Published in:Physical review letters 2013-02, Vol.110 (5), p.051101-051101, Article 051101
Main Authors: Nishizuka, Naoto, Shibata, Kazunari
Format: Article
Language:English
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Summary:We propose the particle acceleration model coupled with multiple plasmoid ejections in a solar flare. Unsteady reconnection produces plasmoids in a current sheet and ejects them out to the fast shocks, where particles in a plasmoid are reflected upstream the shock front by magnetic mirror effect. As the plasmoid passes through the shock front, the reflection distance becomes shorter and shorter driving Fermi acceleration, until it becomes proton Larmor radius. The fractal distribution of plasmoids may also have a role in naturally explaining the power-law spectrum in nonthermal emissions.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.110.051101