T.I. Kaltman, A.N. Korzhavin
St.-Petersburg Branch of the Special Astrophysical Observatory,
Russian Academy of Sciences, St.-Petersburg 196140, Russia
The modeling of microwave emission from spot associated cyclotron source was done to refine the method of estimations of effective brightness temperature, size and height above photosphere in treatment of RATAN-600 observations. The simple model of source with a dipole distribution of magnetic field and with a two-step transition region between the cold dense chromosphere and the hot corona was used. While source approaches to the limb a decreasing of source visible size in E-W direction takes place due to projection effect, which causes a decreasing of its effective size in treatment of one-dimensional scan of RATAN-600. The following gauss-analysis would overestimate the values of brightness temperatures if necessary corrections were not done. The same projection effect leads to the fact, when the sizes of source observed in polarized emission (Stokes parameter V) exceed the sizes of the source in full intensity emission (Stokes parameter I) due to non circular distribution of polarized emission. The method of estimates of the effective height of emission above photosphere level by measurements of emission centre of weight declination from source geometrical centre at approaching to the limb was modeled and applied to the treatment of RATAN-600 observations. The derived value of height of transition region and of the base of corona above sunspots is discussed.