Storm time electric field penetration observed at mid-latitude

Physics

Scientific paper

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Auroras, Ionospheric Ion Density, Magnetic Storms, Midlatitude Atmosphere, Plasma Drift, Convective Flow, Evening, Geomagnetism, Particle Precipitation, Plasma Layers, Solar Terrestrial Interactions

Scientific paper

A detailed analysis is presented of the latitudinal structure of the F region ion convection observed during the maximum phase of the great February 8-9, 1986 magnetic storm. The double-peaked westward ion drift pattern characterized the convection structure in the 1600-2200 MLT sector. The latitude and magnitude of the high-latitude maximum varied more sensitivity with UT than those of the low-latitude maximum. The high-latitude westward ion drift peak was collocated with the boundary plasma sheet-central plasma sheet transition boundary, and the low-latitude drift peak fell between the equatorward edges of the electron and soft ion precipitation. Evidence is reported for the presence of heated plasmaspheric ions in the vicinity of the low-latitude ion drift peak. The latitude and magnitude variations of the low-latitude ion drift peak are closely related to those of the maximum of the O(+) ring current-dominated energy density distribution.

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