Physics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12.1144w&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 12, p. 1144-1157
Physics
5
Charged Particles, Earth Ionosphere, Earth Magnetosphere, Geomagnetism, Incoherent Scatter Radar, Interplanetary Magnetic Fields, Low Altitude, Particle Precipitation, Dmsp Satellites, Electron Energy, Explorer 47 Satellite, Magnetic Storms, Plasma Density, Plasma Drift, Predictions
Scientific paper
Coincident multi-instrument magnetospheric and ionospheric observations have made it possible to determine the position of the ionospheric footprint of the magnetospheric cusp and to monitor its evolution over time. The data used include charged particle and magnetic field measurements from the Earth-orbiting Viking and DMSP-F7 satellites, electric field measurements from Viking, interplanetary magnetic field and plasma data from IMP-8, and Sondrestrom incoherent scatter radar observations of the ionospheric plasma density, temperature, and convection. Viking detected cusp precipitation poleward of 75.5 deg invariant latitude. The ionospheric response to the observed electron precipitation was simulated using an auroral model. It predicts enhanced plasma density and elevated electron temperature in the upper E- and F- regions. Sondrestrom radar observations are in agreement with the predictions. The radar detected a cusp signature on each of five consecutive antenna elevation scans covering 1.2h local time. The cusp appeared to be about 2 deg invariant latitude wide, and its ionospheric footprint shifted equatorward by nearly 2 deg during this time, possibly influenced by an overall decrease in the interplanetary magnetic field (IMF) B(sub z) component. The radar plasma drift data and the Viking magnetic and electric field data suggest that the cusp was associated with a continuous, rather than a patchy, merging between the IMF and the geomagnetic field.
de La Beaujardiere Odile
Lummerzheim Dirk
Newell Patrick T.
Potemra Thomas A.
Rich Frederic J.
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