Among the space weather subjects of research, geomagnetic storm and its effects on space and ground-based technologies has been of great interest to space scientists. For ages, geomagnetic storm has been observed after sunspot appearance, this in turn implies that there is a connection between the two. This study is aimed at finding the correlation between sunspot and geomagnetic storm over three solar cycles (i.e. solar cycle 21, 22, and 23). Our result shows a positive correlation between the two parameters with a correlation coefficient (r) of about 0.6. It was observed that severe geomagnetic storm is most likely around the solar maximum (The period when the sunspot numbers are most likely to be at the peak or high) and during declining years of sunspot cycle, it tends to halt at the sunspot minimum (Period when sunspot number is at its minimum). These findings are indicative of the interdependence of geomagnetic storms on the number of sunspot.
Key words: Sunspot number; Geomagnetic storm, Dst, CME, Solar cycle
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