Studies on some aspects of the solar H-alpha flares of different visual features

Abstract

The visual features of the four types of solar H-alpha radio flares were studied in relation to the occurrence of radio bursts, sunspots, and the distribution of flares on the solar disk. Flare types A and T were the most frequent and infrequent types of flares, respectively. Flare types K and U were found to be more durable than K and L types, but K and L types had greater rise times in comparison with the other types of flares. The distribution of A-type flares corresponded to the location of sunspots of the alpha_p configuration having magnetic fields of 500-200 G. The distribution of the remaining flare types was associated with sunspots in the Alpha_p, Beta_p, and Beta and Delta configurations with magnetic field strengths in the range 1000-2000 G. In general, flare types J, K, and U were comparatively burst productive, while G-type bursts were not. Curves showing the cumulative percentage occurrence of the different types of flares are provided.