Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/cats/~satr/RFSymp/abs/01_Abramov-Maximov.pdf Дата изменения: Mon Oct 9 11:39:00 2006 Дата индексирования: Tue Oct 2 12:09:59 2012 Кодировка:

PECULIARITIES OF QPOS OF MICROWAVE EMISSION OF THE FLARING SOLAR ACTIVE REGIONS
V.E. Abramov-Maximov, G.B. Gelfreikh Central Astronomical Observatory at Pulkovo, Saint-Petersburg, Russia gbg@saoran.spb.su Quasi-p erio dic oscillations of solar coronal structures are effectively registered in particular at microwave waves. The physical nature of p erio dical pro cesses in the corona is clearly connected with plasma structures of the solar atmosphere. On the other hand, the mo dern conception is that pro cesses leading to eruption of energy in solar flares are results of energy accumulation in the corona or chromosphere pro duced by some reconstruction of plasma structures. In spite of developments of the mo dern observations predominantly using cosmic techniques, we are still far from a satisfactory observational understanding of the ab ove processes. The QPOs of solar active regions were found decades ago and their connections with the flares were detected. Nevertheless, the physical nature and p ossible forecasting applications are still far from a reasonable level of knowledge. New development of microwave instruments with a high spatial resolution and regular observations (NoRH, RATAN­600, SSRT at Badary) op ened a new era in such studies. Oscillations with p erio ds from few minutes to hours were investigated and their time variations were sp ecially analysed. So, we may conclude that investigations of these parameters for ARs with different levels of flare activity, time variations including, may lead to a b etter understanding of the physics of the problem. Some preliminary results of such studies are presented in this rep ort, based on an analysis of the Nob eyama radio maps of the Sun with the 10 sec averaging and covering p erio ds of hours of observations (dates 11 Sep 2001, 07 Oct 2002, including), and comparing these with sp ectral parameters of the regions obtained with RATAN­600. This study was partially supp orted by the Program of the Presidium or the Russian Academy of Sciences.