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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