Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..900b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, Sept. 1983, p. 900-903. USAF-supported research.
Physics
20
Equatorial Atmosphere, Geomagnetism, Gravity Waves, Magnetohydrodynamic Stability, Plasma Bubbles, Spread F, Energy Dissipation, Magnetic Field Configurations, Magnetohydrodynamic Waves, Standing Waves, Taylor Instability
Scientific paper
The density fluctuations ('irregularities') in the nighttime equatorial F region of the ionosphere, commonly referred to as Equatorial Spread F (ESF), are considered. It has been believed that the Rayleigh-Taylor instability, which is excited by gravity directed against a density gradient, is responsible for the large-scale bottomside density irregularities. The present investigation is concerned with a gravity-driven instability. It is shown that the curvature of the magnetic field lines makes it appropriate to consider localized modes, of the so-called ballooning-type, which have significant amplitude variation and are standing along the field lines. It is proposed that the dissipative gravitational instability discussed is responsible for the nighttime equatorial bottomside F region density irregularities.
Basu Baidyanath
Coppi Bruno
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