Nonlinear investigation of the spatial resonance effect in the nighttime equatorial F region

Details Nonlinear investigation of the spatial resonance effect in the nighttime equatorial F region Nonlinear investigation of the spatial resonance effect in the nighttime equatorial F region

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3753k&link_type=abstract

Journal of Geophysical Research, vol. 83, Aug. 1, 1978, p. 3753-3760.

Physics

15

Atmospheric Models, Equatorial Atmosphere, F Region, Night Sky, Nonlinear Systems, Density Distribution, Gravity Waves, Ion Density (Concentration), Magnetic Fields, Periodic Variations, Turbulent Diffusion, Wave Propagation

Scientific paper

An ionospheric model is presented which, on the condition that the continuity equation can be solved mainly by analytical methods, describes the premidnight equatorial F layer as well as possible. An attempt is made to determine whether the spatial resonance effect can indeed produce the observed nonlinear large-scale structure of the equatorial spread F. A coefficient of turbulent diffusion is introduced to limit the perturbation amplitude. It is shown that a zonally propagating gravity wave in the nighttime equatorial F layer moves the ionization across the magnetic field as if there were no field. The strong periodic changes of the ionization-density gradient give rise to a periodic generation and modulation of small-scale spread F irregularities explaining the large-scale patches of irregularities which are normally seen to travel eastward and downward. More importantly, the spatial resonance effect is capable of creating field-aligned tubes of decreased ionization density.

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