Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/cats/~satr/RFSymp/abs/17_Korzhavin.ps Дата изменения: Mon Oct 9 11:14:23 2006 Дата индексирования: Tue Oct 2 10:00:46 2012 Кодировка: Поисковые слова: vela satellite

ESTIMATIONS OF EFFECTIVE HEIGHT, SIZE AND
BRIGHTNESS TEMPERATURE OF SOLAR CYCLOTRON
SOURCES
A.N. Korzhavin, T.I. Kaltman
Special Astrophysical Observatory of RAS, Saint­Petersburg, Russia
arles@mail.ru
The modeling of microwave emission from a spot­associated cyclotron source was done to
refine the method of estimations of e#ective brightness temperature, size and height above
photosphere in the processing of RATAN­600 observations. The simple model of a source
with a dipole distribution of magnetic field and with a two­step transition region between
the cold dense chromosphere and the hot corona was used.
When a source approaches the limb the decrease of a source visible size in E­W direction
takes place due to the projection e#ect, which causes the decrease of its e#ective size in
processing of a one­dimensional scan of RATAN­600. The subsequent Gauss­analysis would
overestimate values of brightness temperatures if necessary corrections were not done.
The same projection e#ect leads to the fact, that the size of source observed in polarized
emission (Stokes parameter V) exceeds the size of the source in full intensity emission
(Stokes parameter I) due to non circular distribution of polarized emission.
The method of estimates of the e#ective height of emission above photosphere level by
measurements of an emission centre of weight declination from a source geometrical centre
at approaching to the limb was modeled and presented.
This work was supported by the RFBR grants 05­02­16228 and 06­02­17034a.