LDE flares in the 20th solar cycle. I - Comparison of the time behaviour of H-alpha grouped and LDE flares

Details LDE flares in the 20th solar cycle. I - Comparison of the time behaviour of H-alpha grouped and LDE flares LDE flares in the 20th solar cycle. I - Comparison of the time behaviour of H-alpha grouped and LDE flares

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991baicz..42..133a&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 42, no. 3, June 1991, p. 133-144.

Astronomy and Astrophysics

Astronomy

9

Solar Cycles, Solar Flares, Solar X-Rays, H Alpha Line, Solar Magnetic Field, Time Series Analysis

Scientific paper

The numerical series of H-alpha and LDE flares are tested and compared for the years 1969-1976, using methods of statistical analysis. The results show that the occurrence of H-alpha flares can be expressed by an exponential function. The analytical expression of the LDE (M - X) flare occurrence (their SXR duration exceeds 2 hours) is a parabola or a set of spline functions. Time intervals with increased flare activities were observed in the years 1970, 1972 and 1974, whereas decreased flare activity was found in 1971 and 1975.

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