Time delay between H-alpha and soft x-ray emissions during solar flares

Abstract

A statistical analysis of time delays between H-alpha and soft x-ray (SXR) emissions at onset and peak respectively during solar flares is presented. We find that at the onset of flares SXR emission starts simultaneously or upto two min earlier than H-alpha emissions. At peak flux the SXR emission is found to be peaked between 2 min before to 3 min after the H-alpha emissions.