Other
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9107h&link_type=abstract
Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 9107-9114. Research supported by the U.S. Defense Nuclear Agency and
Other
16
Atmospheric Density, Atmospheric Diffusion, Density Distribution, Equatorial Atmosphere, Spread F, Diffusion Coefficient, Drift Rate, E Region, Ionospheric Drift, Irregularities, Transport Properties
Scientific paper
The diffusion of small-scale density irregularities (i.e., those with density gradient scale lengths less than several hundred meters) is investigated during the decay phase of equatorial spread F. Both classical and anomalous diffusion processes are considered. The anomalous diffusion coefficient is based upon the transport properties associated with the universal drift instability. It is found that anomalous diffusion can smooth out small-scale density irregularities on time scales tau, consistent with observational results, i.e., tau is roughly between a few minutes and a few hours. On the other hand, classical diffusion is much too slow a process to be important. Also, anomalous diffusion is unable to diffuse large-scale irregularities, i.e., those with scale lengths greater than a kilometer, on time scales less than approximately a few hours and another mechanism must occur to smooth out these irregularities, e.g., shorting out to the E region.
Huba Joseph D.
Ossakow S. L.
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