Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

“P hysics o f Auroral P henom ena”, Proc. XXXIII A n n u a l Sem inar, A patity, pp. 8 7 - 90, 2011 © Kola Science Centre, Russian Academy of Science, 2011 Polar Geophysical Institute THE ACTIVE REGION MAGNETIC FLUX CORRELATION WITH FLARES APPEARANCE I. M. Podgom y1, and A. I. Podgomy 2 1Institute fo r Astronomy RAS, Moscow, Russia, podgorny@inasan.ru 2Lebedev Physical Institute RAS, Moscow, Russia Abstract. Association of the active region magnetic flux and powerful solar flares (class X) are investigated for active regions AR 10486 and AR 10365. These regions traveling along the solar disk produced several powerful flares. The flares appeared when magnetic flux is exceeded Ю 20 Maxwell. During all flares accept one the magnetic flux has been unchangeable. During this flare the magnetic flux decreased by 10%. Such flux decreasing occurred also without flares. The magnetic energy transfer from photosphere to corona during a flare was not occurred. Such behavior of the magnetic field in active regions is in agreement with the idea o f explosive release that has been accumulated in a current sheet created above the active region. Introduction In the last three hundred years the solar activity demonstrates the 11 year period. The powerful solar flares appear during the years of solar activity. Solar flares are produced above active regions, where the magnetic field can reach thousands Gauss. There are many attempts to development observed solar date to find out any regularity in sola activity directed to solar activity prediction in future. Such attempts achieve seeming success in prediction of previous (23-th) cycle development. Fig. 1. a). Time dependence of solar activity (sunspot number), b). Cycle 20 shown by broken lines is overlapped on cycle 23. 87