Abstract
Using data from the Yohkoh Bragg crystal spectrometer (BCS) and soft X-ray telescope (SXT), we study a solar flare of 15 April 1993 which occurred at about 9 UT. SXT observations indicate that the flare occurred well beyond the western solar limb, meaning that our observations are restricted to the upper-most portions of the flaring structure. Rise-phase BCS spectra show strong bulk lineshifts, that is, shifts of the entire spectral line profiles. Concurrent with these bulk lineshifts, the spectra show “blue wing” asymmetries. Both bulk lineshifts and blue wings are very infrequent characteristics of flares observed near the solar limb. Our studies give us insight into mass motions along flaring loops, and information about the uppermost regions of solar flares. Sterling et al. (1996, ApJ., in press) give a full report on this event.
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