Diagnostics of solar flare and evaporated plasma using mm-wave emission

Physics

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Chromosphere, Evaporation, Millimeter Waves, Plasma Diagnostics, Plasma Oscillations, Solar Flares, Bremsstrahlung, Electron Beams, Magnetohydrodynamic Waves, Plasma Density, Plasma Temperature

Scientific paper

A method is presented for deriving the density, temperature, and loop length of a chromospheric evaporated plasma based on the pulsation characteristics of mm-wave emissions from a solar flare. The pulses have a period of about 5 s, and the characteristics of the plasma are determined in terms of the Alfvenic oscillations of the loop and the bremsstrahlung mechanism of the mm-wave emission. The second peak of the mm-wave burst is shown to be caused by thermal bremsstrahlung of the chromospheric plasma, and the plasma characteristics inferred according to this model are consistent with X-ray observations and analyses. The flare of June 22, 1989 is analyzed by means of the present model and shown to have electron beams with insufficient energy to account for chromospheric plasma evaporation.

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