Seasonal dependence of the distribution of large-scale plasma depletions in the low-latitude F region

Details Seasonal dependence of the distribution of large-scale plasma depletions in the low-latitude F region Seasonal dependence of the distribution of large-scale plasma depletions in the low-latitude F region

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7625d&link_type=abstract

Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7625-7639.

Physics

4

Equatorial Atmosphere, Ionospheric Drift, Plasma Density, Space Plasmas, Spread F, Annual Variations, Atmospheric Electricity, Density Distribution, Explorer Satellites, Geomagnetism, Ionospheric Ion Density, Plasma Drift, Thermosphere, Wind Effects

Scientific paper

From several years of Atmosphere Explorer data, it is shown that large-scale plasma density depletions (horizontal scale greater than 1000km) in the nocturnal F region occur mainly during the first half of the night. The geomagnetic latitude of these depletions depends on season: at solstice periods the occurrence is mainly in the summer hemisphere and at equinoxes mainly on the geomagnetic equator. Large-scale depletions occur most often at longitudes characterized by a large magnetic declination. The large-scale plasma depletions are interpreted to be a consequence of imposed upward drift which raises the F region above the satellite trajectory. This interpretation is tested by calculating the vertical ion drift velocity imposed by zonal and meridional winds and electrostatic fields, with allowance for the effects of diffusion. The calculations reveal a correspondence between the locations of maxima in the calculated vertical ion drift velocity and the large-scale plasma depletions.

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