Solar flare dynamics obtained by X-ray observations
The dynamic properties of solar flares are considered on the basis of the spectral observations of soft X-rays of more than 180 flares obtained during the last two decades. The random non-thermal velocities are in the range from 60 to 580 km s−1 but mainly change from 110 to 190 km s−1. The mean value of the ξ calculated for flares being mainly of C1-M5 X-ray classes are equal to 160.8 ± 4.7 km s−1. The directed velocities in flares are from several dozen to several hundred kilometres per second. The relationships between ξ and other flare characteristics are discussed. Investigations of flare dynamics help us to understand the nature of energy transport in them.
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