Bulg. J. Phys. vol.39 no.4 (2012), pp. 323-330

A Statistical Study between Sunspot Area and Geomagnetic Field over a Period of Ten Years

R. Ali1, M. Chakraborty2, A. Guha2, B.K. De2
1Department of Physics, Netaji Subhash Mahavidyalaya, Udaipur-799120, Tripura, India
2Department of Physics, Tripura University, Suryamaninagar-799022, Tripura, India
Abstract. Sunspots play the role of host to solar flares and Coronal Mass Ejections (CME). Spots of larger area have more intense magnetic field and flare activity increases with increase in magnetic field. The Earth's magnetosphere is hit by solar flares causing geomagnetic storms, i.e. abrupt change the Earth's horizontal (H) and vertical magnetic field (Z). In the present study, very good correlation between daily sunspot area and variation in H and Z is found. It is observed that the variation in H and Z with sunspot area is nonlinear in nature.

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