Abstract

We discuss the energy release process in a solar flare. The onset of this flare in soft X-rays was detected at 00:18 UT on April 22nd, 1994, by the IRIS X-ray spectrometer, which was a component of the scientific payload in the international complex research project on solar-terrestrial phenomena on board the CORONAS-I automatic orbital station. An analysis of energy spectra and time profiles of soft X-ray radiation indicates that no usual expansion of flaring volume occurred at the decay of this flare. On the contrary, thermal insulation of the hot plasma could be in effect.

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