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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 3
Ann. Geophys., 17, 438–441, 1999
https://doi.org/10.1007/s00585-999-0438-1
© European Geosciences Union 1999
Ann. Geophys., 17, 438–441, 1999
https://doi.org/10.1007/s00585-999-0438-1
© European Geosciences Union 1999

  31 Mar 1999

31 Mar 1999

Letter to the Editor: Geomagnetic storm effects at low latitudes

R. G. Rastogi R. G. Rastogi
  • School of Physics, University of New South Wales, Sydney 2052, Australia
  • and Department of Physics, Gujarat University, Ahmedabad 380 009, India

Abstract. 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.

Key words. Ionosphere (electric fields and currents) · Magnetospheric physics (electric fields; storms and substorms)

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