Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42..425r&link_type=abstract
Solar Physics, vol. 42, June 1975, p. 425-439.
Astronomy and Astrophysics
Astronomy
20
Solar Flares, Solar Prominences, Solar X-Rays, X Ray Density Measurement, Chromosphere, Decay Rates, Emission Spectra, Field Emission, H Alpha Line, High Temperature Plasmas, Ogo-5, Oso-7, Solar Spectra, Spaceborne Astronomy, Thermal Radiation
Scientific paper
The data from OGO-5 and OSO-7 X-ray experiments have been compared with optical data from six chromospheric flares with filament disruption associated with slow thermal X-ray bursts. Filament activation accompanied by a slight X-ray enhancement precedes the first evidence of H-alpha flare by a few minutes. Rapid increase of the soft X-ray flux accompanies the phase of fastest expansion of the filament. Plateau or slow decay phases in the X-ray flux are associated with slowing and termination of filament expansion. The soft X-ray flux increases as F approaches (A + Bh)h, where h is the height of the disrupted prominence at any given time and A and B are constants. We suggest that the soft X-ray emission originates from a growing shell of roughly constant thickness of high-temperature plasma due to the compression of the coronal gas by the expanding prominence.
ROY Jean-Rene
Tang Fukun
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