Physics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12..688a&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 7, p. 688-690
Physics
2
Earth Ionosphere, Electron Density Profiles, Gravity Waves, Ionospheric Disturbances, Ionospheric Electron Density, Computerized Simulation, Fast Fourier Transformations, Nonlinearity, Perturbation Theory
Scientific paper
Linear theory predicts that disturbances in the ionospheric electron density field will closely resemble the characteristics of the forcing gravity wave. In this short note a simple mechanistic model which includes the effects of non-zero divergence of the nonlinear flux has been developed. The model indicates that higher frequency modes are generated when the gravity wave amplitude is sufficiently large. The harmonics can exhibit highly non-sinusoidal behavior and this has implications for attempts to interpret medium-scale TIDs in terms of acoustic gravity wave activity.
Arnold Neil F.
Robinson Terry R.
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