Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986baicz..37..344o&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 37, Nov. 1986, p. 344-358.
Astronomy and Astrophysics
Astronomy
5
Solar Flares, Solar X-Rays, Sunspot Cycle, Solar Atmosphere
Scientific paper
Twenty-seven out of 106 solar flares that occurred in two closely spaced regions between October 7 and October 14, 1981 are analyzed with regard to H-alpha and soft- and hard-X-ray emissions. The H-alpha and X-ray analysis of the LDE (long-duration-event) flare of October 12, 1981 is presented. On October 12, three strong X-ray flares were seen at 04:38, 06:15 and 10:33 UT. A detailed analysis of flare at 06.15 UT showed that the flare had two impulsive hard X-ray phases. In the course of the second impulsive phase, the dark post-flare loops vanished and the third central ribbon became more distinct. The third central H-alpha ribbon can be interpreted as radiation which is generated in the hot loop tops, although the loops were located in the bottom part of the arcade. It was proved that flare pairs had quasi-synchronous origins in four cases.
Antalová Anna
Ogir' M. B.
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