Physics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...78..107a&link_type=abstract
Solar Physics, vol. 78, May 1982, p. 107-123. Consiglio Nazionale delle Ricerche
Physics
234
Solar Flares, Solar Spectra, Solar X-Rays, Calcium, Iron, Solar Maximum Mission, X Ray Spectra
Scientific paper
Observations using the bent crystal spectrometer instrument on the Solar Maximum Mission show that turbulence and blue-shifted motions are characteristic of the soft X-ray plasma during the impulsive phase of flares, and are coincident with the hard X-ray bursts observed by the hard X-ray burst spectrometer. A method for analysing the Ca XIX and Fe XXV spectra characteristic of the impulsive phase is presented. Nonthermal widths and blue-shifted components in the spectral lines of Ca XIX and Fe XXV indicate the presence of turbulent velocities exceeding 100 km/s and upward motions of 300-400 km/s. The April 10, May 9, and June 29, 1980 flares are studied. The April 10 flare has two separated footpoints bright in hard X-rays. Plasma heated to temperatures greater than ten million K rises from the footpoints. During the three minutes in which the evaporation process occurs an energy of 3.7 x 10 to the 30th ergs. This is consistent with the above figures, allowing for loss by radiation and conduction.
Acton Loren W.
Antonucci Ester
Culhane Leonard J.
Doyle Gerry J.
Gabriel Alan H.
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