YOHKOH Observations of an Over-the-Limb Solar Flare with Large Spectral Line Shifts

Details YOHKOH Observations of an Over-the-Limb Solar Flare with Large Spectral Line Shifts YOHKOH Observations of an Over-the-Limb Solar Flare with Large Spectral Line Shifts

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...464..498s&link_type=abstract

Astrophysical Journal v.464, p.498

Astronomy and Astrophysics

Astronomy

18

Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

We present observations of a solar flare of 1993 April 15 near 9 UT, using data from the Yohkoh Bragg crystal spectrometer (BC S) and soft X-ray telescope (SXT). Observations from SXT indicate that the flare occurred well beyond the solar limb, meaning that our observations are restricted to the uppermost portions of the flaring structure. BCS spectra show strong bulk blueshifts of the spectral line profiles for a short period near the start of the event, followed by an extended period of strong bulk redshifts of the line profiles. Concurrent with these bulk line shifts, the spectra show "blue wing" asymmetries. Both bulk line shifts and blue wings are infrequent characteristics of flares observed near the solar limb. Our observations are consistent with strong upward mass motions occurring on a high-altitude flaring loop oriented edge-on with the Earth. We find nonthermal line broadenings in the spectra which are qualitatively and quantitatively similar to line broadenings in spectra of disk flares. Near peak intensity of the flare, ≤10% of the residual nonthermal broadening can be explained by the spatial distribution of the soft X-ray flaring structure.

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