Abstract
The analysis of the profile and intensity of the soft X-ray lines formed in the wavelength range from 1.8 Å to 20 Å, observed with the Soft X-ray Polychromator of the Solar Maximum Mission (SMM), shows that solar flare plasmas are characterized by non-thermal velocities. Flare plasmas in general consist of two components at different temperatures: 5–8 10 6 K and 16–25 10 6 K, respectively. The non-thermal mass motions observed in the hotter component are affected by higher velocities and they depend on temperature in a way which is varying with the flare phase. The results obtained for flare plasmas are consistent with the functional relationship between temperature and non-thermal velocity derived for the lower temperature regimes existing in the upper chromosphere, in the transition region and in the non-flaring corona.
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