Equatorial density depletions observed at 840 km during the great magnetic storm of March 1989

Details Equatorial density depletions observed at 840 km during the great magnetic storm of March 1989 Equatorial density depletions observed at 840 km during the great magnetic storm of March 1989

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9613931g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 13,931-13,942.

Mathematics

Logic

65

Equatorial Atmosphere, F 2 Region, Ionospheric Ion Density, Magnetic Storms, Thermal Plasmas, Ionospheric Drift, Particle Trajectories, Plasma Probes, Remote Sensing, Satellite Instruments

Scientific paper

Significant decreases in ion density, detected at 840 km by two thermal plasma probes, are described and discussed with respect to ground-based measurements to develop a phenomenological model. The observations are described in detail including changes in the F2 layer, changes in plasma drifts, and contradictory evidence regarding ion densities. Very large ion densities are given by the first satellite crossing, followed by a two passes in which same depletions noted by a second satellite are identified. The model is developed according to the data which shows that rapid upward drifts can produce depletions in the equatorial ion density with sharp gradients in their high-latitude boundaries. Low-altitude satellite data are an important complement to ground measurements because they add data on a large horizontal scale regarding detectable ionospheric changes during magnetic storms.

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