Time dependent response of equatorial ionospheric electric fields to magnetospheric disturbances

Details Time dependent response of equatorial ionospheric electric fields to magnetospheric disturbances Time dependent response of equatorial ionospheric electric fields to magnetospheric disturbances

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..851f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 7, p. 851-854

Physics

113

Earth Ionosphere, Earth Magnetosphere, Electric Fields, Magnetic Disturbances, Magnetosphere-Ionosphere Coupling, Time Dependence, Computerized Simulation, Incoherent Scatter Radar, Periodic Variations, Radar Measurement, Time Lag

Scientific paper

We use extensive radar measurements of F region vertical plasma drifts and auroral electrojet indices to determine the storm time dependence of equatorial zonal electric fields. These disturbance drifts result from the prompt penetration of high latitude electric fields and from the dynamo action of storm time winds which produce largest perturbations a few hours after the onset of magnetic activity. The signatures of the equatorial disturbance electric fields change significantly depending on the relative contributions of these two components. The prompt electric field responses, with lifetimes of about one hour, are in excellent agreement with results from global convection models. The electric fields generated by storm time winds have longer lifetimes, amplitudes proportional to the energy input into the high latitude ionosphere, and a daily variation which follows closely the disturbance dynamo pattern of Blanc and Richmond (1980). The storm wind driven electric fields are responsible for the larger amplitudes and longer lifetimes of the drift perturbations following sudden decreases in convection compared to those associated with sudden convection enhancements.

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