Letter to the Editor: Geomagnetic storm effects at low latitudes

Other literature type English OPEN
Rastogi, R. G. (1999)
  • Journal: (issn: 1432-0576, eissn: 1432-0576)
  • Related identifiers: doi: 10.1007/s00585-999-0438-1
  • Subject:
    arxiv: Physics::Geophysics | Physics::Atmospheric and Oceanic Physics | Physics::Space Physics

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.<br><br><b>Key words.</b> Ionosphere (electric fields and currents) · Magnetospheric physics (electric fields; storms and substorms)
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