High resolution observation of H-alpha solar flares and temporal relation between H-alpha and X-ray, microwave emission

Astronomy and Astrophysics – Astrophysics

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H Alpha Line, Microwave Emission, Solar Flares, Solar X-Rays, Temporal Distribution, Fine Structure, High Resolution

Scientific paper

The authors studied the evolutional characteristics of fine structures in Hα flare emitting regions and their relation to X-ray and microwave emissions for selected events observed with the 60 cm Domeless Solar Telescope at Hida Observatory, University of Kyoto. The principal conclusions of this investigation are: (1) Hα kernel consists of some finer bright points or Hα flare points whose individual size is less than 1 arc sec. (2) Impulsive brightenings of Hα flare points occurred simultaneously with the spikes of the hard X-ray and microwave bursts within the time resolution of the authors' Hα observations which varied from 1 to 10 s. (3) It is concluded that fast electron beams must be the principal mechanism of heating Hα flares during the impulsive phase of a flare.

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