Equatorial disturbance dynamo electric fields

Details Equatorial disturbance dynamo electric fields Equatorial disturbance dynamo electric fields

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..537f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, July 1983, p. 537-540.

Physics

59

Atmospheric Circulation, Dynamo Theory, Electric Fields, Equatorial Atmosphere, F Region, Ionospheric Disturbances, Magnetic Storms, Auroral Electrojets, Ionospheric Drift, Magnetic Disturbances, Thermosphere, Wind Effects

Scientific paper

F-region vertical drift data from Jicamarca, Peru show that equatorial east-west electric fields are sometimes perturbed 16-24 hours after the onset of geoemagnetic storms. These disturbance dynamo electric fields, which must be caused primarily by the action of neutral winds at low and middle latitudes, decrease and sometimes even reverse the quiet time electric field pattern during both daytime and nighttime. The long delay excludes the possibility that gravity waves are responsible and suggests that the thermospheric circulation is disturbed. The data also show that after some storms there are no such delayed disturbances, a fact which may be due to the longitudinal structure of the disturbances at high latitudes and/or that only very strong storms can produce major thermospheric perturbations that extend to middle and low latitudes.

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