Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..333m&link_type=abstract
In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 333-337 (SEE N85-24544 14-46)
Physics
Convection Currents, Earth Magnetosphere, Ionospheric Disturbances, Magnetic Storms, Dynamo Theory, Electric Fields, Interplanetary Magnetic Fields, Neutral Currents, Radar Scattering
Scientific paper
Two case studies of ionospheric disturbances in electric fields, currents, and winds during periods of geomagnetic storms detected by incoherent scatter radar are presented. The disturbances are shown to originate from two distinct physical mechanisms: penetration of electric fields to lower latitudes during times of rapid change in magnetospheric convection; and the action of the disturbed ionospheric dynamo driven by storm induced wind disturbances. One storm illustrates penetrative convection electric fields when the Bz component of the interplanetary fields turns southward and northward. The observed events on the following day are clearly identifiable as the delayed response of the disturbance ionospheric dynamo.
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