Spread F bubbles - Nonlinear Rayleigh-Taylor mode in two dimensions

Details Spread F bubbles - Nonlinear Rayleigh-Taylor mode in two dimensions Spread F bubbles - Nonlinear Rayleigh-Taylor mode in two dimensions

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3189h&link_type=abstract

Journal of Geophysical Research, vol. 83, July 1, 1978, p. 3189-3194.

Physics

2

Ionospheric Propagation, Propagation Modes, Spread F, Taylor Instability, Bubbles, Diurnal Variations, Equatorial Atmosphere

Scientific paper

The paper discusses long-wavelength developed bottomside spread F which has been attributed to the Rayleigh-Taylor instability. The nonlinear saturation amplitude and the k spectrum of the inertia-dominated Rayleigh-Taylor instability is found in two directions: east-west and vertical. As in the collisional case (Chaturvedi and Ossakow, 1977), the dominant nonlinearity is found to be two-dimensional. It is found that the linearly most unstable modes, which are primarily horizontal, saturate by the nonlinear generation of vertical spatial harmonics. The harmonics are damped by diffusion or recombination. The resulting amplitude spectrum indicates that bubbles are vertically elongated in both inertial and collisional regimes.

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