Gyrosynchrotron Emission from Anisotropic Electron Distributions

G.D. Fleishman

V.F. Melnikov

We present numerical calculations of the intensity, degree of polarization and spectral index of gyrosynchrotron emission produced by fast electrons with anisotropic pitch-angle distributions. The anisotropy is found to affect the emission substantially. The emission intensity can change up to a few orders of magnitude at the optically thin region compared with the isotropic case. The local value of spectral index changes considerably (up to a factor of 3-4) with the anisotropy.

X-mode polarization increases for loss-cone distributions and decreases for beam-like distributions. Moreover, the sense of polarization can correspond to ordinary wave-mode at the optically thin region for a certain range of the view angles for beam-like distributions. We present a few evidences of the important role of the pitch-angle anisotropy in the observations of solar microwave continuum bursts.