Abstract
Polarization of the thermal bremsstrahlung at microwaves presents essential information on the longitude component
of the magnetic field in the solar plasma. The Nobeyama radioheliograph opens a new page in applying the
observtions of polarized component to make radio magnetograms of the whole solar disk, based on analysis of the
thermal bremsstrahlung:
(i) the instrument has 10 arcsec 2D resolution,
(ii) regular eight hours per day observations during the last seven years, and
(iii) using ten minute averaging of the radio maps in V Stokes parameter gains sensitivity of few Gauss. The results
mostly refer to chromospheric magnetic fields in the solar active regions and are in good agreement with optical data.
However, three ways to measure also coronal component of the magnetic fields are considered:
(i) observations of coronal structures behind the limb;
(ii) additional spectral observations made with RATAN-600 with proper solution of the equations of radiation
transfer;
(iii) an analysis of the transformation of circularly polarized sygnal in quasi-transverse region of propagtion
(inversion or smoothing of circularly polarized component). In the present paper we consider, analyze and illustrate
the above probems on some observational results of the solar active regions.