Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/cats/~satr/RFSymp/abs/01_Abramov-Maximov.ps Дата изменения: Mon Oct 9 11:14:23 2006 Дата индексирования: Tue Oct 2 11:49:06 2012 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п

PECULIARITIES OF QPOS OF MICROWAVE EMISSION OF
THE FLARING SOLAR ACTIVE REGIONS
V.E. Abramov­Maximov, G.B. Gelfreikh
Central Astronomical Observatory at Pulkovo, Saint­Petersburg, Russia
gbg@saoran.spb.su
Quasi­periodic oscillations of solar coronal structures are e#ectively registered in particular
at microwave waves. The physical nature of periodical processes in the corona is clearly
connected with plasma structures of the solar atmosphere.
On the other hand, the modern conception is that processes leading to eruption of energy
in solar flares are results of energy accumulation in the corona or chromosphere produced
by some reconstruction of plasma structures.
In spite of developments of the modern observations predominantly using cosmic tech­
niques, we are still far from a satisfactory observational understanding of the above pro­
cesses. The QPOs of solar active regions were found decades ago and their connections with
the flares were detected. Nevertheless, the physical nature and possible forecasting appli­
cations are still far from a reasonable level of knowledge. New development of microwave
instruments with a high spatial resolution and regular observations (NoRH, RATAN--600,
SSRT at Badary) opened a new era in such studies. Oscillations with periods from few
minutes to hours were investigated and their time variations were specially analysed. So,
we may conclude that investigations of these parameters for ARs with di#erent levels of
flare activity, time variations including, may lead to a better understanding of the physics
of the problem. Some preliminary results of such studies are presented in this report, based
on an analysis of the Nobeyama radio maps of the Sun with the 10 sec averaging and
covering periods of hours of observations (dates 11 Sep 2001, 07 Oct 2002, including), and
comparing these with spectral parameters of the regions obtained with RATAN--600.
This study was partially supported by the Program of the Presidium or the Russian
Academy of Sciences.