Other
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991esasp.330..129k&link_type=abstract
In ESA, Cluster Dayside Polar Cusp p 129-137 (SEE N92-26294 17-46)
Other
1
Convection, Electrojets, Interplanetary Magnetic Fields, Magnetic Signatures, Magnetic Storms, Magnetosphere-Ionosphere Coupling, Data Acquisition, Ground Stations, Magnetic Measurement, Magnetometers, Satellite Observation
Scientific paper
The importance of coordinated satellite and ground based observations in studies of 'ionosphere magnetosphere interactions' is stressed by showing examples of ionspheric electrodynamic parameters. Satellite and radar measurements of the ionospheric drift velocity, along with ground based magnetometer observations for 25 Oct. 1981, were combined to estimate instantaneous patterns of electric fields and currents in the high latitude ionosphere, using an updated version of the AMIE (Assimilative Mapping of Ionospheric Electrodynamics) technique. The period under study was characterized by a relatively stable southward IMF (Interplanetary Magnetic Field), so that the obtained electric field patterns reflect, in general, the state of sustained and enhanced plasma convection on the magnetosphere. During one of the satellite passes, an intense westward electrojet caused by a substorm intruded into the satellite and radar field of view on the premidnight sector, providing a unique opportunity to differentiate the enhanced convection and substorm expansion fields. The calculated potential distributions for the expansion phase of the substorm are indeed of general two cell patterns, but the night-morning cell has two positive peaks, one on the midnight sector and the other in the late morning hours, corresponding to the substorm expansion and the convection enhancement, respectively.
Kamide Yohsuke
Richmond Arthur D.
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