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A computer simulation based on fluid equations of motion seems to account for basic observational features of short wavelength type 2 (subsonically propagating) ionization irregularities in the equatorial electrojet. The short wavelengths (less than 28 meters for parameters taken here) are excited only after long wavelengths, horizontally propagating waves grow to an amplitude sufficient to trigger the nonlinear growth of secondary vertically propagating modes. The result is a complicated two dimensional turbulent flow, with convective elements moving with comparable vertical and horizontal velocities. The density fluctuation power spectrum obeys approximately a power law k to the minus 3.5 power. These results agree with theory and observation.
The importance of ionospheric irregularities in the overall concept of dynamic ionospheric physics modeling is emphasized. In particular, ionospheric irregularities produce scintillation which cause communication and radar system degradation. The determination, classification and nonlinear development of such instabilities, in terms of theoretical and numerical studies, is of fundamental importance. This report gives an overview of ionospheric irregularities and specific results in two areas: (1) nonlinear development of the type II E region equatorial electrojet instability and (2) plasma clouds, image effects and striations in the ionosphere.
Temporal and spatial power spectra from computer simulations of the equations modeling Type II irregularities in the equatorial electrojet are presented. The power spectra are computed using the code of Ferch and Sudan, averaging over times as long as 20 seconds. The dependence of the average frequencies and linewidths on wavelenght and angle from the electrojet drift is studied. The mean frequencies obtained agree well with linear theory except at short wavelengths while the linewidths are greater than those predicted by the linear damping rates. The spatial power spectra were also computed and found to be approximately isotropic. (Author).
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