Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stin...8517923d&link_type=abstract
Presented at 2nd Indo-US Workshop on Solar Terrest. Phys., New Delhi, 20 Jan. - 3 Feb. 1984
Physics
Solar Flares, Solar X-Rays, X Ray Spectra, Coronal Loops, Electron Beams, Flux (Rate), Solar Maximum Mission, Stellar Models
Scientific paper
Solar Maximum Mission observations of three flares that impose stringent constraints on physical models of the hard X-ray production during the impulsive phase are presented. Hard X-ray imaging observations of the flares on 1980 November 5 at 22:33 UT show two patches in the 16 to 30 keV images that are separated by 70,000 km and that brighten simultaneously to within 5 s. Observations to O V from one of the footprints show simultaneity of the brightening in this transition zone line and in the total hard X-ray flux to within a second or two. These results suggest but do not require the existence of electron beams in this flare. The rapid fluctuations of the hard X-ray flux within some flares on the time scales of 1 s also provide evidence for electron beams and limits on the time scale of the energy release mechanism. Observations of a flare on 1980 June 6 at 22:34 UT show variations in the 28 keV X-ray counting rate from one 20 ms interval to the next over a period of 10 s. The hard X-ray spectral variations measured with 128 ms time resolution for one 0.5 s spike during this flare are consistent with the predictions of thick-target non-thermal beam model.
Dennis Brian R.
Frost Kenneth J.
Kiplinger Alan L.
Orwig Larry E.
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