The sun’s atmosphere is frequently disrupted by coronal mass ejections (CMEs) coupled with different solar happening like sun spot number (SSN), geomagnetic storms (GMS), 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 events. CMEs are considered as the major natural hazardous happening at the surface of sun because this event can cause several other phenomena like solar flare and many more. In this work, we report a statistical observation for the relationship of CMEs having linear speed >500 km/s with SSN and solar flares that were registered during the period 1997-2015. Test results of the annual correlation between SSN and CMEs is 0.77 and can be represented by a linear regression equation. We concluded that SSN and solar flares are well correlated with CMEs in most of the yearly compiled data for this time span.

In this paper we have selected radio burst related geomagnetic storms of magnitude ≤-90nT from 1997-2012 (i.e. solar cycle 23&24). For this period we have found 42 geomagnetic storms and most of the geomagnetic storms are associated with halo and partial halo coronal mass ejections (CMEs) with association rate 67.57% and 32.43% respectively. Statistical analyses are performed to examine the relationship of magnitude of geomagnetic storms and speed of CME we observed weak correlation (0.28) between these two events. Further we have selected the average number of sunspot and find the statistical relation with average speed of radio burst related geomagnetic storms CMEs. We observed with statistical results of annual correlation between sun spot number (SSN) and halo and partial halo CMEs is 0.16 and 0.49 respectively and can be represented by a linear regression equation.

Geomagnetic storm (GMs) is a significant unsettling influence of Earth's magnetosphere that happens when there is an extremely productive trade of energy from the solar wind into the space climate encompassing Earth. Storms result from variations in the solar wind that produces significant changes in the flows, plasmas, and fields in Earth's magnetosphere. A southward directed solar wind magnetic field at the dayside of the magnetosphere is responsible to create GMs, large GMs are associated with coronal mass ejections (CMEs) also. In this work we take the GMs of magnitude ≤ -100 nT and CMEs having velocity more than 1000 km/s from 2010-2020. During this time span we have noted 28 geomagnetic storms (GMs).To analyze the GMs with other solar activities (Flares & CMEs) conducted a statistical analysis of the data of the Dst (disturbance storm time) index of Geomagnetic storms and Solar flare flux and CMEs. We found the low positive correlation between Dst index and the solar flare flux with correlation coefficient 0.21. We also found a correlation between the Dst index with different classes of flares (X and M), there is a strong positive correlation between Dst index and X class solar flare having coefficient 0.97, further the correlation of Dst index and M class flare is very low with correlation coefficient 0.04. We found that the CMEs are negatively correlated with Dst index with correlation -0.09. The present result implies that the geomagnetic storms formation dependent on the flares particularly x class but does not on the CMEs during the time taken.

Abstract

We have observed 74 short term asymmetric cosmic ray intensity decreases for the period 1997-2013, which