Velocity-temperature distribution in the evaporating plasma during the impulsive phase of solar flares
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Abstract
A combined analysis of the Ca SIS and Fe SSV spectra obtained by the SMM bent crystal spectrometer is used to study the velocity-temperature distribution in the plasma evaporating from the chromosphere during the impulsive phase of solar flares. The velocity distributions from the Ca XIX spectra have a maximum velocity of 500 km/s, while those from the Fe XXV spectra extend to a maximum of 800 km/s. It is shown that the evaporating plasma is not in isothermal conditions and that the material flowing at higher velocity is characterized by higher temperatures. Observed and simulated velocity distributions are compared. The results imply that high evaporation velocities are caused by chromospheric heating with an energy flux which exceeds 10 to the 10th ergs/sq cm s.
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