Postsunrise refilling of the low-latitude topside ionosphere

Details Postsunrise refilling of the low-latitude topside ionosphere Postsunrise refilling of the low-latitude topside ionosphere

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4201b&link_type=abstract

Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4201-4206.

Computer Science

Sound

2

Diurnal Variations, Ionospheric Sounding, Plasma Density, Satellite Observation, Sunrise, Upper Ionosphere, Density Measurement, F Region, Meteorological Satellites, Plasma Diagnostics, Polar Orbits, Refilling, Tropical Regions

Scientific paper

Plasma density measurements from a polar-orbiting Defense Meteorological Satellite Program satellite at 840 km have shown the existence of significant plasma depletions near the magnetic equator in the postsunrise hours. The phenomenon is observed regularly during magnetically quiet times near the equinoxes. The magnitude of the depletion depends upon longitude and the time elapsed since sunrise in the lower F region. It is significantly less pronounced or absent near the solstices. During magnetically active periods the low-latitude topside ionosphere is modified due to vertical E x B plasma drifts in the predawn sector. The quiet-time equinox observations are interpreted in terms of a diurnal flux-tube filling model. It is suggested that the observed equatorial depletions result from a pair of plasma fronts that are moving upward from conjugate ionospheres and that are associated with the early stages of the postsunrise refilling process.

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