Abstract
Pulsations of mm-wave emission with a period of about 5 s, which occurred during the impulsive phase of the flare of June 22, 1989, are investigated. It has been shown that these pulsations can be driven by Alfvénic oscillations of a flare loop excited due to upward motion of the chromospheric evaporated plasma. A method is proposed to determine the density and temperature of the evaporated plasma as well as the flare loop magnetic field and loop length in terms of Alfvénic oscillations of the loop and bremsstrahlung mechanism of mm-wave emission. The estimation of evaporated plasma energy has shown that for the flare of June 22, 1989 the energy content in electron beams is insufficient for chromospheric plasma evaporation. It is not excluded that the main energy release process occurs in the chromosphere.
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Stepanov, A.V., Urpo, S. & Zaitsev, V.V. Diagnostics of solar flare and evaporated plasma using mm-wave emission. Sol Phys 140, 139–148 (1992). https://doi.org/10.1007/BF00148434
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DOI: https://doi.org/10.1007/BF00148434