Solar Microwave Bursts: Homologous Events from Different Active Centres

Abstract

FOKKER¹ has pointed out that the occurrence of similar radio events from the Sun is much more likely to be observed in a comparison of signals originating from the same centre of solar activity than in a comparison of arbitrarily selected events from different centres. Most studies of similarities between solar radio bursts—the study of homologous bursts, in other words—have concentrated on events originating in the same centre of activity^2,4. The concept of homology can also be applied to records obtained in Hα and at hard X-ray wavelengths. The occurrence of homologous events suggests that the magnetic morphology of the centre concerned remains unchanged from one event to the other.