Statistical Influences of Sun Spot Numbers and Solar Radio Fluxes on Geomagnetic Field during the Period 1986-2008

Geomagnetic field is highly affected by solar activities e. g. sun spot numbers (SSN). Sun spot numbers are dark and irregular spots which are usually appear in groups on the suns photosphere and disappear after a few days or week. Sun spot appear dark; since the temperature of sun spot is less as compare to photosphere temperature i. e. we can say that the sun spot numbers are cooler than the surrounding surface of sun (i. e. photosphere). During the period of solar cycle 22 and 23; We have been studied total 383 magnitude of geomagnetic storms (Dst -50 nT) out of them 251 are moderate, 106 are intense and 26 are severe. From this study we have determined positive correlation between sun spot numbers and total number of magnitude of geomagnetic storms with correlation coefficient 0.68 ( 0.40, 0.80 and 0.65 respectively) between sun spot number and number of magnitude of geomagnetic storms (moderate, intense and severe) and obtained a good correlation for intense and severe geomagnetic storms with sun spot numbers. Also, we have determined positive correlation between solar radio flux and total number of magnitude of geomagnetic storms with correlation coefficient 0.66 ( 0.38, 0.77 and 0.69 respectively) between solar radio flux and number of magnitude of geomagnetic storms (moderate, intense and severe) and obtained a good correlation for intense and severe geomagnetic storms with solar radio flux. Also we have been found that a very good correlation 0.99 between yearly average sun spot numbers and yearly average solar radio flux.