Flare?Puffs as a Cause of Type III Radio Bursts

Abstract

An analysis has been made of the association of type III solar radio bursts with flares which show sudden bright expansions, or "puffs", Type III bursts occur within ±2 min of the times of two-thirds of the puffs; by comparison, they occur during the whole lifetimes of about one-quarter of flares of all types (Loughhead, Roberts, and McCabe 1957). Most if not all puffs are followed by surges, and hence it appears that the same explosion yields two quite different ejections; one, at velocities of the order of one-fifth that of light, is responsible for the burst, and the other, at velocities of the order of 100 km/sec, is the surge.