Periodical patterns in major flare occurence and their relation to
magnetically complex active regions
M. Temmer (1),
A. Veronig (1),
J. Rybák (2),
R. Brajsa (3),
A. Hanslmeier (1)
1 - Institut for Geophysics, Astrophysics and Meteorology, Universitätsplatz 5, A-8010 Graz, Austria
2 - Astronomical Institute, Slovak Academy of Sciences, SK-05960 Tatranská Lomnica, Slovakia
3 - Hvar Observatory, Faculty of Geodesy, University of Zagreb,
Kaciceva 26, HR-10000 Zagreb, Croatia
A periodical occurrence rate of solar major flares (observed in hard X-rays)
of ~24 days (synodic) was first reported by Bai (1987) for the years
1980-1985. Its origin is still far from being untrusted. A significant
relation between appearance of the 24-day period in major H alpha flares
and magnetically complex sunspot groups (i.e. including a gamma and/or delta
configuration) is found. From synoptic maps of magnetograms (NSO/KP) patterns
in the evolution of magnetic flux which might be the cause of a 24-day
period in flare activity are traced.
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