Estimate of coronal magnetic fields from contour maps of the intensity and polarization degree of the burst on 1992 October 27 Original Research Article

In this paper contour maps at 17 GHz of the 1992 October 27 solar burst are analysed. Using a nonthermal inhomogeneous model of the radio source, variations of calculated brightness temperature with distance from the projected center of the source is in better agreement with the observed map at 01 : 45 : 29.889 UT. The calculation shows that the characteristic magnetic field gradient αB (magnetic field distribution is Bm(r/rm)αB = 2000(r/rm)−2) at the peak of the 17 GHz emission is about 2, magnetic strength B is about 737 G with the magnetic field Bm of the core being 2000 G. On the other hand, from the polarization contour map and the “limiting polarization” concept, we obtain a magnetic moment d = 1.4 – 2.5 × 1032 cgs units, and a coronal magnetic field B = 20 – 30 G at the height of 1.7 – 1.9 × 1010 cm.