Study of some characteristics of solar energetic particles and associated solar activities during 1996–2016

Abstract

Solar energetic particles (SEP) are believed to originate from two different sources, coronal mass ejections (CMEs) and solar flares. In this paper, we have also investigated some statistical properties such as speed, apparent angular width, acceleration, latitude distribution of SEP effective CMEs observed during the period 1996–2016 covering the solar cycle 23 and solar cycle 24. We find that 76% SEP event associated with solar flares originates in the western hemisphere. We also found that SEP associated CMEs are faster and nearly halo in nature. The study shows that mean starting frequency of SEP events associated DH-type II radio burst is 10.9 MHz. We have also investigated the time delay between the flare start/peak time and related SEP, CME and type II burst start time and it is to be found that almost all SEP events occur later than the start time of the flare, CME, m-type II bursts and DH type II radio events.