Journal : Acta Geophysica
Article : Dependence of time derivative of horizontal geomagnetic field on sunspot number and aa index

Authors :
Eshagh, M.
Division of Geodesy and Geoinformatics, Royal Institute of Technology (KTH), Stockholm, Sweden; Department of Geodesy, K.N.Toosi University of Technology, Tehran, Iran,,
Teisseyre, R.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,,
Lizurek, G.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,,
Asfahani, J.
Atomic Energy Commission, Damascus, Syria,,
Baddari, K.
Laboratory of Physics of the Earth UMBB, Boumerdes, Algeria,,
Bose, S. K.
Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur, West Bengal, India,,
Romanowicz, R. J.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,,
Pagliara, S.
Department of Civil Engineering, University of Pisa, Pisa, Italy,,
Huang, S.
Potsdam Institute for Climate Impact Research, Potsdam, Germany,,
Kubrak, E.
Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences, Warszawa, Poland,,
Falayi, E. O.
Department of Physics, Tai Solarin University of Education, Ijebu-Ode, Nigeria,,
Abstract : This work investigated an interrelationship between the monthly means of time derivatives of horizontal geomagnetic field, dH/dt, sunspot number, Rz, and aa index for the period of substorms (from –90 to –1800 nT) during the years 1990-2009. A total of 232 substorms were identified during the period of study. The time derivative of horizontal geomagnetic field, dH/dt, used as a proxy for geomagnetically induced current (GIC) exhibited high positive correlation with sunspot number (0.86) and aa index (0.8998). The obtained geomagnetic activity is in 92.665 per cent explicable by the combined effect of sunspot number and aa index. The distribution of substorms as a function of years gives a strong support for th e existence of geomagne tic activity increases, which implies that as the sunspot number increases the base level of geomagnetic activity increases too.

Keywords : solar activity, time derivatives of geomagnetic fields, sunspot number, substorms,
Publishing house : Instytut Geofizyki PAN
Publication date : 2013
Number : Vol. 61, no. 1
Page : 211 – 222

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Qute : Eshagh, M. ,Teisseyre, R. ,Lizurek, G. ,Asfahani, J. ,Baddari, K. ,Bose, S. K. ,Romanowicz, R. J. ,Pagliara, S. ,Huang, S. ,Kubrak, E. ,Falayi, E. O. ,Falayi, E. O. , Dependence of time derivative of horizontal geomagnetic field on sunspot number and aa index. Acta Geophysica Vol. 61, no. 1/2013