Possible errors in radio source parameters recovered by the fitting method related to anisotropy of the electron distribution

This paper examines errors in recovering (radio diagnostics) solar flare parameters (magnetic field, accelerated electron density, etc.) by fitting microwave spectra. The analysis was performed by diagnosing two model radio sources with known preset parameters, including given parameters of the pitch-angle anisotropy of emitting electrons. The diagnostics was carried out by a genetic minimization algorithm. It is shown that using the traditional approach on the assumption about isotropy of pitch angular distribution of electrons leads to significant systematic errors, in particular, to a strong underestimation of the magnetic field strength in the presence of longitudinal anisotropy of pitch angular distribution of electrons in a real radio source. When restoring the same parameters in view of possible anisotropy, the accuracy of the restoration increases markedly.