Accepted articles

Reviews of topical problems

Modern analytical models of electrons acceleration and propagation in solar flares

Lomonosov Moscow State University, Shternberg State Astronomical Institute, Universitetskii prosp. 13, Moscow, 119889, Russian Federation

A review of the current state of the kinetic theory of acceleration and propagation of energetic (thermal and non-thermal) electrons during solar flares is presented. The classical models of a thick-target and their further development are considered in detail — models that take into account the effect of the reverse-current and the acceleration of electrons in collapsing magnetic traps. Analytical solutions of the corresponding kinetic equations are found. Based on these solutions, the characteristics of the bremsstrahlung X-ray emission generated by energetic electrons are calculated. The obtained results are compared with modern data of high-precision observations of flares. The degree of X-ray polarization is calculated, and the possibilities of measuring it in future space experiments are discussed.

Keywords: Sun, solar flare, electrons acceleration, kinetic equation, collision integral, bremsstrahlung, polarization
PACS: 96.60.−j, 96.60.qe, 96.60.Iv, 96.60.Tf (all)
DOI: 10.3367/UFNe.2021.08.039048
Citation: Gritsyk P A, Somov B V "Modern analytical models of electrons acceleration and propagation in solar flares" Phys. Usp., accepted

Received: 28th, July 2021, revised: 20th, August 2021, 27th, August 2021

Оригинал: Грицык П А, Сомов Б В «Современные аналитические модели ускорения и распространения электронов в солнечных вспышках» УФН, принята к публикации; DOI: 10.3367/UFNr.2021.08.039048

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