Storm-time variation of the horizontal and vertical components of the geomagnetic fields and rate of induction at different latitudes

Falayi, E O and Oyebanjo, O. A. and Omotosho, T. V. and Okusanya, A.A. (2016) Storm-time variation of the horizontal and vertical components of the geomagnetic fields and rate of induction at different latitudes. Advances in Space Research, 58. pp. 1208-1218. ISSN 02731177

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Abstract

The paper presents the hourly mean variation of horizontal (H) and vertical (Z) components of the geomagnetic field and the rate of induction DH/DZ at different latitudes during magnetic storm of 20 March 2001 and 1 October 2001. The results of the analysis revealed that at high latitude stations greater than 60�, the reduction in DH component was noticed after the noon time while other stations less than 60� experienced reduction of H in the morning time during the geomagnetic storm. Large amplitude of DH and DZ were exhibited during the daytime over the equatorial zone, the amplitude decreases from mid latitudes to the dip equator during the nighttime. The daytime enhancement of DH at AAE, BAN and MBO suggest the presence of a strong eastward directed current which comes under the influence of electrojet. There were strong positive and negative correlations between ring current (DR) and horizontal component of the magnetic field DH. The effect of rate of induction is more significant at high latitudes than lower latitudes, during the geomagnetic storm. More enhancement in rate of induction occurred at nighttime than daytime. This result may be from other sources other than the ionosphere that is magnetospheric process significantly contributes toward the variation of induction.

Item Type:	Article
Uncontrolled Keywords:	Geomagnetic field; Geomagnetic storm; Electromagnetic induction; Ring current; Coronal mass ejection
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Divisions:	Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	27 Mar 2018 15:18
Last Modified:	27 Mar 2018 15:18
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/10517

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