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Journal of Physical Studies 13(2), Article 2902 [7 pages] (2009)
DOI: https://doi.org/10.30970/jps.13.2902 THE EVOLUTION AND FLARE ENERGETIC RELEASE OF ACTIVE REGION 10069 IN AUGUST 2002I. S. Laba{1}, P. G. Lisnyak {2}, I. Ya. Pidstryhach{1}
1Ivan Franko National University of Lviv, Astronomical
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The evolution and flare energetic release of AR 10069 are studied according to observations of the Sun made at the Astronomical Observatory of the Ivan Franko National University of Lviv and the Internet data (http://sxi.ngdc.noaa.gov/).
A large active region (NOAA AR 10069, SO7L298) was passing along the visible Sun disk on 11-24 August 2002. It was characterized by a very large and complicated leading spot with prevailing S-polarity and $βγδ$ magnetic configuration. The AR 10069 looked compact and intermixed with little magnetic elements of opposite polarity on the magnetogram by MDI/SOHO. A unification of the leading part of the spot group with its back part was observed (Aug. 14) as well as the appearing of satellite region AR 10077 (Aug. 13), emerging of new twisted magnetic flow of N-polarity (Aug. 16), rearrangement of magnetic polarities (Aug. 20-21), and increase of the spot group to maximal values (Aug. 20). Both changes of magnetic field and proper motions of separate cores were slow. High level of activity (Aug. 16-24) was characterizing by a high contribution of M-class flare X-rays at AR 10069, and two flares of X-class.
The comparison of AR 10069 with AR 10486, which has produced a series of very powerful flares (up to X28), testifies to the fact that if the energy which was stored in AR releases into high quantity of flares the energetics of each flare is low. A low quantity of flares at such AR increases the probability of appearance of more powerful flares.
AR 10069 has produced 76 X-ray flares and 122 optical flares.
Having rather disbalanced magnetic flow of N-, S-polarity, the complicated and great AR may produce the largest quantity of faint C-class flares, M-class flares approximately three times less, and seldom X-class flares.
PACS number(s): 97.10.Ex