Statistical Observation of Coronal Mass Ejections and Solar flares


The sun’s atmosphere is frequently disrupted by coronal mass ejections (CMEs) coupled with different solar phenomena like geomagnetic storms, solar energetic particle and solar flare. CMEs play the important role in the root cause of weather in earth’s space environment among all solar phenomena’s. CMEs are considered as the major natural hazardous phenomena at the surface of sun because this event can cause several other phenomena like solar flare and many more. In this manuscript coronal mass ejection (CMEs) and solar flare events have been taken over a large time span from 1998 to 2013. There were thousands of CMEs and solar flares which were observed but under some condition that is linear speed of CMEs should be equal or greater than 500Km/Sec. On this basis numbers of selected CMEs were 357 which were associated with different types of solar flares. In order to find out the correlation between coronal mass ejections with different categories of solar flares statically, we have found that CMEs event was not recorded for A- class flares. Whereas 45, 132, 113 and 67 CMEs events were observed for B, C, M and X-class solar flares respectively. We apply the statistical model and found that coronal mass ejections (CMEs) and solar flares are correlated to each other with very strong positive correlation coefficient (r = 0.79) for X-class flare and strong positive correlation coefficient (r =0.4) for C-class flare and no relation for B-class flares and M-class flare.

Keywords: – coronal mass ejections, Solar flares, solar magnetic cycle.

Preetam Singh Gour, Devangana S. Chaturvedi