A comparative study of Hα-flares of different visual features in relation to radio bursts and sunspots

Abstract

Solar H α-flares now reported with their distinctive visual features have been statistically examined for a period of about eight years in relation to their different characteristics, flare-burst and flare-sunspot association. Important results obtained are: (i) Integrated intensity changes from the highest to the lowest values in the order F, H, E, and D flare type, whereas, impulsiveness in the order H, F, E, and D type, (ii) Flare-burst association is frequency dependent and is highest and lowest for H and D types respectively in almost all the frequencies, (iii) Most of the flares of D, E, and F types are associated with sunspots of β _p, α_p, and δ configurations having field strength 1500-2500 G, while that of H type with β _p and β configurations having field strength 1000-2000 G.