Equatorial Spread F instability conditions as determined from ionograms

Details Equatorial Spread F instability conditions as determined from ionograms Equatorial Spread F instability conditions as determined from ionograms

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..692a&link_type=abstract

Geophysical Research Letters, vol. 9, June 1982, p. 692-695. Financiadora de Estudos e Projetos

Physics

23

Equatorial Atmosphere, Magnetohydrodynamic Stability, Spread F, Ionograms, Ionospheric Electron Density, Sunset

Scientific paper

Conditions of plasma irregularity (or Spread F) generation under the Rayleigh-Taylor mechanism in the nighttime equatorial ionosphere are examined from ionogram data registered over Fortaleza (4 deg S, 38 deg W, mag. dip lat. -1.7 deg), Brazil, for a one year period. The results show that local ionospheric conditions such as the bottomside F-region electron density scale length and the ion-neutral collision frequency at the base of the layer, at sunset hours, determine the generation of the spread F irregularities over the equator in the post-sunset hours.

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