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FREQUENCY DEPENDENCE OF THE POWER-LAW INDEX OF SOLAR RADIO BURSTS

We process solar flare observations of Nobeyama Radio Polarimeters with an improved maximum likelihood method developed recently by Clauset et al. The method accurately extracts power-law behaviors of the peak fluxes in 486 radio bursts at six frequencies (1–35 GHz) and shows an excellent performance in this study. The power-law indices on 1–35 GHz given by this study vary around 1.74–1.87, which is consistent with earlier statistics in different solar cycles and very close to the simulations of the avalanche model by Lu.