Electron acceleration in collapsing magnetic traps during the solar flare on July 19, 2012: observations and models

Gritsyk, P.A.; Somov, B.V.

Авторы: Gritsyk P.A., Somov B.V.
Журнал: Proceedings of the International Astronomical Union
Том: 13
Номер: S335
Год издания: 2018
Первая страница: 90
Последняя страница: 93
DOI: 10.1017/S1743921317008912
Аннотация: 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 footpoint 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.
Добавил в систему: Грицык Павел Александрович

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Electron acceleration in collapsing magnetic traps during the solar flare on July 19, 2012: observations and modelsстатья

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