Geomagnetic equatorial anomaly in zonal plasma flow

Details Geomagnetic equatorial anomaly in zonal plasma flow Geomagnetic equatorial anomaly in zonal plasma flow

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..311a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 311-315.

Physics

32

Equatorial Atmosphere, Geomagnetism, Magnetic Anomalies, Magnetohydrodynamic Flow, Plasma Dynamics, Plasma-Electromagnetic Interaction, Dynamics Explorer 2 Satellite, Magnetic Signatures, Plasma Density, Plasma Probes, Vertical Distribution

Scientific paper

The observation of a geomagnetic signature in the zonal eastward plasma flow, which is a striking feature of the equatorial ionosphere in the evening quadrant is reported. These observations were derived fronm (E x B)/B-squared measurements made with the cylindrical double-floating-probe experiment carried on the Dynamics Explorer 2 satellite. The signature consists of a crest-trough-crest effect in the latitude dependence of the eastward plasma flow with the crests at + or - 8 dip latitude and the trough nearly centered at the dip equator at all geographic longitudes. This phenomenon can be readily interpreted in terms of the altitude dependence of the F region dynamo electric field, and it is related to dip equator signatures in the plasma density and the magnetic declination which have been reported earlier.

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