The Flares Associated with the Dynamics of the Sunspots

Abstract

In the present study, we consider six years data of spot groups that have well developed leading and following spots obtained from the Kodaikanal Observatory white light pictures and occurrence of Hα flares. From the daily observations, we compute the variations in rotation rates, meridional velocity, the areas and longitudinal separations. We find that among all these variations, the occurrence of abnormal rotation rates (the rotation rates that have greater than 1σ) and longitudinal minimum separation during the course of their evolution eventually lead to triggering of flares. We also find that the events of abnormal rotation rates, longitudinal minimum separation and the flares occur mainly during the 50-80% of the sunspots' life span indicating magnetic reconnection probably below (0.935 R ) the solar surface. Relevance of these results with the conventional theory of magnetic reconnection is briefly discussed.