Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..961f&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Aug. 1990, p. 961-972.
Physics
3
Ionospheric Disturbances, Ionospheric Drift, Plasma Density, Plasma Turbulence, F Region, Plasma Dynamics, Power Spectra, Statistical Distributions
Scientific paper
This paper reports some results derived by studying statistical characteristics of irregularities which are produced as a result of plasma mixing by random drifts. It is found that as time progresses, the irregularity amplitude grows in proportion to sq rt of t. Characteristics of the irregularity spectrum undergo more violent changes. For example, the spectrum width grows according to a law close to the exponential one. Thus, relatively large-scale random motions rapidly generate a broad spectrum of small-scale irregularities as small as meter scales. A broadening of the spectrum is stopped by the transverse diffusion or by the longitudinal diffusion and recombination. An assessment is made of the influence of these processes.
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