Geomagnetic storm effects at low latitudes

Rastogi, R. G. (1999) Geomagnetic storm effects at low latitudes Annales Geophysicae, 17 (3). pp. 438-441. ISSN 0992-7689

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The geomagnetic horizontal (H) field from the chain of nine observatories in India are used to study the storm-time and disturbance daily variations. The peak decrease in storm-time variation in H showed significant enhancements at the equatorial electrojet stations over and above the normally expected decrease due to the ring current effects corrected for geomagnetic latitudes. The disturbance daily variation of H at equatorial stations showed a large decrease around midday hours over and above the usual dawn-maximum and dusk-minimum seen at any mid-latitude stations around the world. These slow and persistent additional decreases of H of disturbance daily variation at equatorial latitudes could be the effect of a westward electric field due to the Disturbance Ionospheric dynamo coupled with abnormally large electrical conductivities in the E region over the equator.

Item Type:Article
Source:Copyright of this article belongs to Copernicus Group.
Keywords:Ionosphere (Electric Fields and Currents); Magnetospheric Physics (Electric Fields; Storms and Substorms)
ID Code:45838
Deposited On:29 Jun 2011 06:55
Last Modified:18 May 2016 01:58

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