Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280l..59s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 280, May 15, 1984, p. L59-L62. NASA-supported resea
Astronomy and Astrophysics
Astronomy
18
Solar Flares, Solar Spectra, Solar X-Rays, Data Reduction, Emission Spectra, Spaceborne Astronomy
Scientific paper
The upward motions of the hot thermal regions of several large (M type) solar flares have been determined from the soft X-ray spectral data recorded by the scanning spectrometer (SOLFLEX) on the P78-1 spacecraft. For the limb flares that are studied, the centroid of the Ca XIX emission region moves to a higher altitude with an apparent speed of 20-40 km/s for a period of 20-30 minutes following onset of the flare and reaches an altitude of 30,000-40,000 km. Although brief periods of downward motion of the emission centroid are observed, substantial decreases in altitude are not observed in any of the flares.
Feldman Uri
Seely John F.
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