A study on severe geomagnetic storms and earth's magnetic field H variations, Sunspots and formation of cyclone

摘要

For our study, we have selected ten severe geomagnetic storms. Which occurred during the years 1994 to 2015. Here great geomagnetic storm of Dst index from -422 nT to -17 nT are taken. These storms are significant not only because of the extremely high magnetic activity but also due to their great impact on the geomagnetosphere. We have studied the relation between severe geomagnetic storms with Earth's magnetic field in horizontal component (H constant) and also studied the relation between Dst index with sunspots number. The H constant data from Kyoto data centre and Dst index.