Observation of chromospheric evaporation during the Solar Maximum Mission

Physics

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Chromosphere, Plasma Acceleration, Solar Flares, Solar X-Rays, Thermal Plasmas, Energy Transfer, Evaporation Rate, Plasma Heating, Solar Corona, Solar Electrons, Solar Maximum Mission

Scientific paper

A study is presented of the upward motions of part of the soft X-ray emitting plasma using data for flares collected in 1980 by the Bent Crystal Spectrometer and the Hard X-ray Burst Spectrometer on the Solar Maximum Mission satellite. Results show that upward motions of the soft X-ray plasma are temporally associated with the build up of the thermal phase of flares and with the period of energy deposition as indicated by the hard X-ray emission. In addition, it is found that the hardness of the hard X-ray spectrum, the evaporation velocity, and the rate of increase of the gradual phase are correlated. It is also possible that the total electron energy deposited in the chromosphere, the peak emission measure of the evaporating plasma, and the peak emission measure of the thermal coronal plasma may also be correlated.

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