Impulsive acceleration of particles in solar flares and their role in plasma heating

A. V. Lysenko

Ioffe Institute, Politekhnicheskaya 26, Saint Petersburg 194021, Russia

(PhD Thesis report)

The energy that powers the flare is contained in a magnetic field and is released when its structure is abruptly rearranged during magnetic reconnection. This energy is spent, in particular, on particle acceleration, solar plasma heating, coronal mass ejections, and so on. Accelerated electrons manifest themselves by gyrosynchrotron emission observed in the microwave range, and bremsstrahlung emission in hard X-ray range. Deceleration of fast electrons in the solar atmosphere results in additional plasma heating. Accelerated ions are observed mainly due to nuclear reactions that produce emission in gamma-ray lines and continuum.

In this work we study the properties of electrons and ions accelerated in solar flares based on observations in hard X-ray and soft gamma-ray ranges by the Konus-Wind experiment. Also the study is dedicated to the features of a special group of solar flares accompanied by abnormally low thermal emission - "cold" flares, according to the observations in X-ray and microwave ranges and modeling.

Russian abstract
Russian

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