Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..273m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Feb. 1990, p. 273-285.
Physics
10
F Region, Geomagnetic Latitude, Ionospheric Disturbances, Density Distribution, Electric Fields, Gravitational Effects, Magnetic Fields, Magnetohydrodynamic Stability
Scientific paper
Macroscopic instability in the nocturnal ionospheric F-region at midlatitudes is examined when eastward external electric fields exist. The instability growth rate is calculated considering plasma in the entire flux tube. Ion density distribution is obtained by a modeling approach, in which the ion continuity equations for O(+) and H(+) are solved. The gravitational Rayleigh-Taylor mode is stable at midlatitudes higher than the crests of the equatorial anomaly, while the E x B mode is unstable at all latitudes when the electric fields are eastward. Net instability growth rate is negative in the narrow region around the magnetic field line which crosses the equator at 1100 km and penetrates the F-layer peak near 18 deg in magnetic latitude. In lower and higher latitude regions, the ionosphere becomes unstable. In the lower latitude region the instability accounts for generation of plasma bubbles, while in the higher latitude region it accounts for generation of plasma ducts, plasma blobs observed in the topside ionosphere, and midlatitude bottomside spread F.
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