HOT-PLASMA EJECTIONS ASSOCIATED WITH COMPACT-LOOP SOLAR-FLARES

Masuda et al. found a hard X-ray source well above a soft X-ray loop i n impulsive compact-loop flares near the limb. This indicates that mai n energy release is going on above the soft X-ray loop, and suggests m agnetic reconnection occurring above the loop, similar to the classica l model for two ribbon flares. If the reconnection hypothesis is corre ct, a hot plasma (or plasmoid) ejection is expected to be associated w ith these flares. Using the images taken by the soft X-ray telescope a board Yohkoh, we searched for such plasma ejections in eight impulsive compact-loop flares near the limb, which are selected in an unbiased manner and include also the Masuda flare, 1992 January 13 flare. We fo und that all these flares were associated with X-ray plasma ejections high above the soft X-ray loop and the velocity of ejections is within the range of 50-400 lan s(-1). This result gives further support for magnetic reconnection hypothesis of these impulsive compact-loop flare s.