Journal
ASTROPHYSICAL JOURNAL
Volume 720, Issue 2, Pages 1603-1611Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/720/2/1603
Keywords
acceleration of particles; magnetic reconnection; Sun: flares
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Funding
- Science and Technology Facilities Council (UK) [ST/F003064/1]
- Science and Technology Facilities Council [ST/F003064/1, ST/H008799/1] Funding Source: researchfish
- STFC [ST/F003064/1, ST/H008799/1] Funding Source: UKRI
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Proton and electron acceleration in a fragmenting periodic current sheet (CS) is investigated, based on the forced magnetic reconnection scenario. The aim is to understand the role of CS fragmentation in high-energy beam generation in solar flares. We combine magnetohydrodynamics and test-particle models to consider particle trajectories consistent with a time-dependent reconnection model. It is shown that accelerated particles in such a model form two distinct populations. Protons and electrons moving in open magnetic field have energy spectra that are a combination of the initial Maxwellian distribution and a power-law high-energy (E > 20 keV) part. The second population contains particles moving in a closed magnetic field around O-points. These particles move predominantly along the guiding field and their energies fall within quite a narrow range between similar to 1 MeV and similar to 10 MeV. It is also found that particles moving in an open magnetic field have a considerably wider pitch-angle distribution.
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