We report observations on the two-ribbon flare of 1980 May 21 by the Hard X-Ray Imaging Spectrometer, the Hard X-Ray Burst Spectrometer, and the UV Spectrometer and Polarimeter aboard the Solar Maximum Mission, as well as H..cap alpha.. and magnetic field data. Our conslusions are (1) the impulsive 16--30 keV X-ray spike bursts originated from separate locations of approx.8'' width, coinciding in position with H..cap alpha.. flare kernels. This hard X-ray emission was caused by beams of accelerated electrons. (2) The impulsive spike bursts came from the footprints of loops arched over a 30'' region where new magnetic flux emerged, which caused eruption of a filament immediately before the flare. (3) Temperatures in excess off 7 x 10/sup 7/ K were observed during the thermal phase. The hot plasma component cooled by anomalous heat conduction, requiring a continuous energy release of approx.2 x 10/sup 29/ ergs s/sup -1/ initially, to approx.4 x 10/sup 28/ ergs s/sup -1/ later on.
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Hoyng et al. (1981) studied this question.