Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..805s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, May 1991, p. 805-808.
Physics
4
Atmospheric Electricity, Auroras, Electrodynamics, Interplanetary Magnetic Fields, Ionospheric Disturbances, Polar Cusps, Field Aligned Currents, Magnetic Disturbances, Magnetohydrodynamic Flow, Particle Precipitation
Scientific paper
Combined ground- and satellite-based information on the electrodynamics of the cusp/cleft ionosphere is used for a case characterized by northward interplanetary magnetic field (IMF). Focus is placed on the auroral dynamics/morphology within the zone of strong azimuthal convection at the cusp poleward boundary. Attention is given to a generator mechanism poleward of the cusp/cleft, giving rise to strong momentum transfer and discrete electron precipitation within a 200-km-wide latitudinal zone at the cusp/cleft poleward boundary. The characteristics of the cusp/cleft ionosphere combined with similar studies of negative IMF B(z) cases indicate that a qualitatively similar mode of solar wind-magnetosphere interaction occurs for both northward and southward IMF.
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