ИСТИНА

One of the most complex processes occurring in solar flares is the acceleration of charged particles to high energies. In the majority of flares, electrons are accelerated in great numbers, and propagating along flare loops, give hard X-ray emission bursts with a power-law spectrum near Earth. Polarization of the hard X-ray emission of solar flares characterizes the angular distribution of fast electrons and their energy spectrum. On the other hand, evolution of the fast electrons distribution function along the flare loop is described by parameters of the distribution function in the source. In this work on the nonthermal interpretation of hard X-ray emission, we suggest that the thick target model with reverse current makes it possible to reconstruct the distribution function and the energy spectrum of accelerated electrons in a source by observing the spectrum and polarization of emission near Earth. The exact analytical approach to a solution of the problem of nonthermal electrons is made possible by finding the distribution function that was used to calculate the spectrum and polarization of hard X-ray emission. The presented model with reverse current was compared with the classical model without the effect of reverse current. All of our results have a visual presentation.