THE ANALYSIS OF GEOMAGNETIC AND SOLAR ACTIVITIES DURING SMY AND TWENTY FIRST SOLAR CYCLE

This paper compares sunspots,Geomagnetic Ap indexes,numbers of ≥2 solar flares,magnetic storms and first,second and third large magnetic storms every solar cycle during 17th-21st solar cycle.The result is in agreement with the prediction of the first writer for geomagnetic maximum of 21st solar cycle.The geomagnetic activity during the 21st solar cycle is higher.This paper analysis of the numbers of ≥2 solar flares and distributionof magnetic storms has been made.Percentage of magnetic storms resulted by 3 solar flares is lower than 19,20 cycle.Type IVand metre wave radio burst are considered to be important conditions to produce magnetic storms.Some typical example of the largest magnetic storms,the largest radio burst resulting magnetic storms,the most severe short wave communication disturbance in ionosphere and magnetic storms resulted by the large solar flare with bright mass ejection and two-ribbon flares are also given.In the end an analysis has been made on the 22 spotless flares during SMY (Solar Maximum Year).There spotless flares may result medium and small magnetic storms.