Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54...49s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Jan. 1992, p. 49-61. Research supported by Physical Re
Physics
6
Atmospheric Turbulence, D Region, Equatorial Atmosphere, Ionospheric Electron Density, Plasma Density, Density Distribution, Electrostatic Probes, Rocket-Borne Instruments
Scientific paper
Plasma density irregularities in the D-region are studied in a large-scale size range (1-300 m) during the daytime. The amplitude of these irregularities ranges from a few percent for small-scale sizes (under 15 m) to 10-15 percent for larger-scale sizes (15-300 m). Spectra of all the daytime irregularities clearly exhibit a change in the spectral index at a scale corresponding to a few tens of meters. Turbulence parameters, namely the vertical turbulent velocity, the energy dissipation rate, the eddy diffusion coefficient, the bouyancy scale, and the Kolmogorov microscale are derived. The spectral index of the irregularities in the inertial subrange is found to be very close to -5/3, indicating that these irregularities are produced by the neutral turbulence mechanism. These irregularities are distinctly different, in their appearance and extent, from the irregularities produced by plasma instabilities such as cross-field and two-stream instabilities.
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