Radar studies of anomalous velocity reversals in the equatorial ionosphere

Details Radar studies of anomalous velocity reversals in the equatorial ionosphere Radar studies of anomalous velocity reversals in the equatorial ionosphere

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.4621f&link_type=abstract

Journal of Geophysical Research, vol. 81, Sept. 1, 1976, p. 4621-4626.

Physics

5

Diurnal Variations, Electric Fields, Equatorial Electrojet, Ionospheric Currents, Magnetohydrodynamic Stability, Radar Measurement, E Region, F Region, Magnetic Equator, Magnetic Storms, Night Sky, Ring Currents, Velocity Measurement

Scientific paper

Radar observations made at Jicamarca, Peru, show that the equatorial-electrojet current and the E- and F-region electric fields can reverse from their normal direction during the day or night and during magnetically quiet or disturbed conditions. The nighttime reversals can only be detected by such radar measurements. The observations support most of the current hypotheses concerning electrojet plasma instabilities. The rapid reversals sometimes seen during disturbed conditions indicate that high-latitude currents and electric fields associated with substorm activity strongly perturb the dynamo current system at all latitudes.

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