Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...720.1603g&link_type=abstract
The Astrophysical Journal, Volume 720, Issue 2, pp. 1603-1611 (2010).
Astronomy and Astrophysics
Astronomy
9
Acceleration Of Particles, Magnetic Reconnection, Sun: Flares
Scientific paper
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 ~1 MeV and ~10 MeV. It is also found that particles moving in an open magnetic field have a considerably wider pitch-angle distribution.
Browning Philippa K.
Gordovskyy Mykola
Vekstein G. E.
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