Nonlinear theory and experimental observations of the local collisional Rayleigh-Taylor instability in a descending equatorial spread F ionosphere

Details Nonlinear theory and experimental observations of the local collisional Rayleigh-Taylor instability in a descending equatorial spread F ionosphere Nonlinear theory and experimental observations of the local collisional Rayleigh-Taylor instability in a descending equatorial spread F ionosphere

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5785k&link_type=abstract

Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5785-5792. Research supported by the U.S. Defense Nuclear Agency and

Physics

Geophysics

24

Equatorial Atmosphere, Ionospheric Disturbances, Nonlinear Equations, Spread F, Taylor Instability, Geophysics, Ionospheric Electron Density, Power Spectra

Scientific paper

The nonlinear evolution of the local collisional Rayleigh-Taylor instability in downward-moving equatorial F layers has been studied in a coordinated theoretical and experimental program dealing with actual conditions of bottomside spread F. For ambient bottomside electron density gradient scale lengths L = 8 and 25 km, we find large percentage depletions and inverse power law spatial power spectra over the intermediate wavelength range of 25 m to 1 km. In addition, a nonlinear theory of the collisional Rayleigh-Taylor instability applicable to an upward- or downward-moving equatorial F region ionosphere is outlined. The agreement between the experimental and theoretical results of this study lends further support to the belief that the collisional Rayleigh-Taylor instability is responsible for large-scale size irregularities that occur under conditions of equatorial spread F.

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