Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990an....311..358a&link_type=abstract
Astronomische Nachrichten (ISSN 0004-6337), vol. 311, no. 6, 1990, p. 358-361.
Astronomy and Astrophysics
Astronomy
Solar Flares, Solar X-Rays, Annual Variations, H Alpha Line, Solar Corona, Sunspot Cycle
Scientific paper
The temporal variations of the occurrence of the (M-X) LDE flares with the soft X-ray (SXR) duration exceeding 2 hours throughout the 20th and the 21st cycles are considered. The characteristics of the 20th cycle: the maximum value of the observed yearly number of LDE flares was in the 1970 (with the total 225 LDE flares observed). The increased LDE flare activities were observed in the years 1972 and 1974. The characteristics of the 21st cycle: the large occurrence of the (M-X) LDE flares was observed from 1979 to 1982. The yearly numbers of the (M-X) LDE flares in 1980 (168), 1981 (151), and 1982 (135) are comparable. The fast decrease of the whole flare activity began at 1983. The percentual representation of the (M-X) LDE flares in the occurrence rate of all H-alpha flares fluctuated between 1 and 3 percent.
Antalová Anna
Viktorinova B.
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