A Preliminary Study Of Activities From Solar Activity Region Leading To The Sun-Earth Connection Event

Because the regions of very large solar active area may produce very strong eruption caused extreme space weather events, what is the relationship between solar cycle sizes and the areas of active regions? This is the first study of the contents of this paper. The results show that the solar cycle size has a poor correlation with the area of largest active region during the cycle, and the time of maximum activity areas sometimes appear before the maximum sunspot number, sometimes in the sunspot number after the maximum, so they do not have a fixed timing relationship.Relativistic protons can lead to ground level enhancement(GLE events), what kind of solar regions can cause GLE events? This is the second study of the contents of this paper. Results show that90.3%of the GLE events that are investigated are accompanied by X-class flares, and that77.4%of the GLE events originate from super active regions. It is found that the intensity of a GLE event is strongly associated with the specific position of an active region where the GLE event occurs. As a consequence, the GLE events having a peak increase rate exceeding50%occur in a longitudinal range fromW20°to W100°. Moreover, the largest GLE events occur in a heliographic longitude at roughly W60°. GLE events source mainly distributed in179°to220°and280°to320°Carrington longitude band.Thirdly, this paper study the relationship between the100MeV solar proton events (SPEs) and super active regions (SARs) in solar cycles22and23. The results show hat56.5%of the100MeV SPEs were produced by SARs. The higher the peak flux of the100MeV SPEs, the higher the ratio of100MeV SPEs produced by SARs. The analysis of distribution of100MeV SPEs in solar cycles22and23shows that most of100MeV SPEs occurred in the descending phase in solar cycles22and23. The yearly number of100MeV SPEs has only one peak in solar cycle22, while the yearly number of100MeV SPEs has four peaks with three of them occurred in the descending phase in solar cycle23. The paper also calculated the correlative coefficients between the intensity of PC of100MeV SPEs (I100) and solar flares/CMEs. The results show that I100has a good correlation with solar flare but poor correlation with CMEs speed so during the pulse phase, energy greater than100MeV proton may be accelerated mainly by the flares.Finally, we analysis the position relationship between magnetic cloud and its driven shock near Earthy, the results shows that the impact of the relationship between ICME and its driven shock factor so much that we did not find the law.