期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：1
页码：18585
DOI：10.15680/IJIRSET.2015.0401024
出版社：S&S Publications
摘要：The solar activity follows an eleven year cyclic variability. The long term changes in the solar activityhave a direct impact on the geomagnetic activity. In the present study, we have investigated the geomagnetic responseof solar activity. To describe the long term variations of the solar activity we have selected two solar activity indicesnamely Sunspot Number (Rz) and solar radio flux (F10.7). Similarly to describe the level of geomagnetic activity wehave taken four geomagnetic indices namely Dst, Kp, Aa and Ap. The study is carried out for the solar cycle 23 andminimum of solar cycle 24. From our study we found that long term changes in the geomagnetic activity follow asynchronous variation with the corresponding changes in the solar activity. We performed correlation analysis betweensolar activity and geomagnetic activity indices to access the magnitude of association between them. From correlationanalysis we found that both the solar activity indices exhibit a strong correlation with all the four geomagnetic indices.The correlation coefficients of Rz with Dst, Kp, Aa and Ap are 0.78, 0.83, 0.81 and 0.86 respectively while those ofF10.7 index with the same indices in the same order are 0.77, 0.83, 0.81 and 0.88.
关键词：Solar Cycle; Solar Indices; Geomagnetic Indices; Plasma.
