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Electron Acceleration in Collapsing Magnetic Traps during the Solar Flare on July 19, 2012: Observations and Models

Published online by Cambridge University Press:  24 July 2018

P. A. Gritsyk  and
B. V. Somov
P. A. Gritsyk
Affiliation:
Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow 119234, Universitetsky pr., 13, Russia email: pgritsyk@gmail.com
B. V. Somov
Affiliation:
Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow 119234, Universitetsky pr., 13, Russia email: somov.boris@gmail.com
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Abstract

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Using the appropriate kinetic equation, we considered the problem of propagation of accelerated electrons into the solar corona and chromosphere. Its analytical solution was used for modelling the M7.7 class limb flare occurred on July 19, 2012. Coronal above-the-loop-top hard X-Ray source was interpreted in the thin-target approximation, the foot-point source - in the thick-target approximation with account of the reverse-current electric field. For the foot-point source we found a good accordance with the RHESSI observations. For the coronal source we also got very accurate estimate of the power-law spectral index, but significant differences between the modelled and observed hard X-ray intensities were noticed. The last discrepancy was solved by adding the coronal magnetic trap model to the thin target model. The former one implies that the trap collapses in two dimensions, locks and accelerates particles inside itself. In our report, we confirm an existence and high efficiency of the electron acceleration in collapsing magnetic traps during solar flares. Our new results represent (e.g. for RHESSI observations) the theoretical prediction of the double step particle acceleration in solar flares, when the first step is the acceleration in reconnection area and the second one – the acceleration in coronal trap.

Keywords

acceleration of particlesSun: coronaflaresmagnetic fieldsX-rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 90 - 93
Copyright
Copyright © International Astronomical Union 2018 

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