Mapping analysis of solar radio burst at 17 GHz on 1992 October 27

The contour maps at 17 GHz on the 1992 October 27 solar burst are analysed. Using a nonthermal inhomogeneous model of the radio source, the variations of calculated source size with time are basically consistent with the obse rvation of maps. The variations of calculated brightness temperature with a distance rho displaced from the project center are in better agreement wit h the observation of map at 0 1 : 45 : 29 : 889 UT. The calculation shows t hat the characterizing magnetic held gradient cu, at the peak of 17 GHz is about 2, magnetic strength B is about 737 G with the magnetic field B, of t he core being 2000 G. However in order to measure the coronal magnetic fiel d accurately, it is necessary to obtain radio-imaging data at more frequenc ies.