The equatorial electrojet and associated currents as seen in Magsat data

Details The equatorial electrojet and associated currents as seen in Magsat data The equatorial electrojet and associated currents as seen in Magsat data

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1233l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 9, p. 1233-1269.

Physics

24

E Region, Equatorial Electrojet, Ionospheric Currents, Magnetosphere-Ionosphere Coupling, Magsat Satellites, Meridional Flow, Earth Core, Earth Crust, Electric Fields, Wind Direction

Scientific paper

In view of the disagreement between reports of Langel and Estes (1985) and those of other investigators using Nagsat data sets, concerning the evidence for equatorial electrojet and meridional currents in the dawn Magsat data, this paper reexamines the Magsat data for the presence of equatorial electrojet and meridional current in both dawn and dusk local times, using a specially designed method for isolating field variations organized by dip-latitude. It is shown that such fields, if any, at dawn are very weak and do not result in a persistent pattern from longitude to longitude or a pattern consistent with that expected from an electrojet current. On the other hand, fields organized by dip-latitude are clearly present in the dusk data and it is possible to isolate longitudinal and seasonal variations in such fields. Current densities are computed for both the equatorial electrojet and meridional currents and are compared to the current densities and distributions found with recent models of the ionospheric dynamo and equatorial electrojet.

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