Physics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7783s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 1, 1983, p. 7783-7793.
Physics
24
Convective Flow, Diurnal Variations, Ionospheric Electron Density, Magnetohydrodynamic Flow, Polar Regions, Flow Velocity, Incoherent Scatter Radar, Ionospheric Drift, Radar Measurement
Scientific paper
The predictions of a high-latitude ionospheric model are compared with the diurnal variations of plasma convection velocities and electron densities observed at Millstone Hill on a geomagnetically moderately active day near equinox. The observed convection pattern was consistent with a two-cell, asymmetric pattern with enhanced plasma flow in the dusk sector, with flow speeds reaching 1.5 km/s. In the dusk strong convection cell, the falloff of the magnetospheric potential with latitude was proportional to the inverse of the sine of colatitude to the fourth power. On the dayside, a region of high density occurred at 500 km in the 1000-1900 LT sector. The nocturnal midlatitude trough was deepest and widest and reached its most equatorward position in the morning sector. The model, which is based on average auroral precipitation fluxes, can describe the gross features of the enhanced densities in the auroral zone.
Evans John V.
Holt John M.
Schunk Robert W.
Sojka Jan J.
Wand Ronald H.
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