Linear theory of equatorial spread F

Details Linear theory of equatorial spread F Linear theory of equatorial spread F

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4581h&link_type=abstract

Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4581-4590.

Physics

11

Ionospheric Drift, Spread F, Taylor Instability, Tropical Regions, Collisional Plasmas, Ionograms, Linear Equations, Plasma Density, Plasma Oscillations, Thermal Conductivity

Scientific paper

A fluid dispersion relation for the drift and interchange (Rayleigh-Taylor) modes in a collisional plasma forms the basis for a linear theory of equatorial spread F. The collisional-drift-mode growth rate will exceed the growth rate of the Rayleigh-Taylor mode at short perpendicular wavelengths and density-gradient scale lengths. The drift mode can grow on the top-side as well as the bottom-side density gradients. It is concluded that below the F peak where spread F predominates, both the drift and Rayleigh-Taylor modes contribute to the total spread F spectrum, with the Rayleigh-Taylor mode dominating at long and the drift mode at short perpendicular wavelengths above the ion Larmor radius.

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