Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..303h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 85, June 1983, p. 303-312.
Astronomy and Astrophysics
Astronomy
12
Emission Spectra, Extreme Ultraviolet Radiation, Radiation Measurement, Solar Flares, Solar X-Rays, Chromosphere, Solar Spectra, Spaceborne Astronomy, X Ray Astronomy
Scientific paper
Soft-X-ray and EUV observations of 16 large X-ray flares obtained with SOLRAD-11 in 1977 and 1978 are reported and compared. X-rays wre measured in the 0.5-3, 1-8, and 8-16 A bands with ionization chambers; EUV was detected in nominal bands of 100-500, 500-800, and 700-1030 A using Be, Sn, or In-shielded LiF photosensitive surfaces. It is shown that the soft-X-ray and EUV emissions of the flares are mainly gradual and of similar duration and magnitude. The data are considered consistent with a two-component model of flare emission: a persistent component (comprising gradual soft X-rays and gradual EUV) and a brief component (comprising impulsive soft and hard X-rays, impulsive EUV, and gradual hard X-rays), with some mechanism linking the two components.
Dere P.
Horan Donald Martin
Kreplin Robert W.
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