Peculiarities of the energy release in the solar flare observed at 00 : 18UT on April 22, 1994

The development of energy-release processes in the solar flare that began a t soft X-ray energies at 00:18 UT on April 22, 1994, is here discussed. The soft X-ray emission was detected by the IRIS X-ray spectrometer, which was included in the scientific payload for an international research project t o investigate solar activity and solar-terrestrial phenomenon on board the automated orbiting station CORONAS-I. Analysis of the energy spectra and ti me profiles of the soft X-ray radiation suggests that the usual expansion o f the flare volume during the late stages of the flare did not occur in thi s event. On the contrary, it appears that the flare plasma may have been th ermally insulated.