The long-term non-thermal energy release on the small-scale flux
level detected at radiowaves
Vladimir Bogod
Abstract
The existence in quiescent solar active region the durable generation
nonthermal emission on the time scale from several hours to several days
is discovered. This emission is detected on the small-scale flux level
(beginning from 3 - 5 Jy to 100 Jy) in decimeter wavelength range in the
form of two types of sources.
The first is the continuum source with high circular polarization
(>70%) and the brightness temperatures (in the range 10^6 - 10^8 K), the
second is the durable microbursts sources (DMB) with high degree of polarization
(100%) and also with high brightness temperatures (>10^9 K).
These sources are registrated on several wavelengths with the
radiotelescope RATAN-600 both intensity and circular polarization in multi-asimuthal
regime.
Some possible interpretation are discussed and new method of
measurements of weak coronal magnetic fields is offered.
Likely, the detected types of sources point at the existence
of a transition region above the active region where the nonthermal emission
begins to prevail.
authors: Vladimir Bogod and Leonid Yasnov
institution: Vladimir Bogod;Special Astrophysical Observatory, 196140,
St.Petersburg, Russia. vbog@gao.spb.ru
Leonid Yasnov; St.Petersburg University, St.Petersburg,
Russia