Estimates of magnetic field strength in the solar corona using observations of thermal radio emission at low frequencies

Measurements of the magnetic field strength in the solar corona at heliocentric distances $r\,{\gtrsim}\,1.1\,R_{\odot}$, using observations other than transient radio bursts, are rare. Circular polarization observations of thermal bremsstrahlung radio emission at frequencies $<$ 100 MHz, which typi