Control of the seasonal and longitudinal occurrence of equatorial scintillations by the longitudinal gradient in integrated E region Pedersen conductivity

Details Control of the seasonal and longitudinal occurrence of equatorial scintillations by the longitudinal gradient in integrated E region Pedersen conductivity Control of the seasonal and longitudinal occurrence of equatorial scintillations by the longitudinal gradient in integrated E region Pedersen conductivity

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..447t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 447-456.

Physics

129

E Region, Equatorial Atmosphere, Ionospheric Conductivity, Scintillation, Annual Variations, Field Aligned Currents, Sunset, Taylor Instability

Scientific paper

The present study is concerned with a comparison of the occurrence patterns of equatorial scintillations reported in literature with the times of sunset in the conjugate E layers. It is shown that both the seasonal and longitudinal dependences of scintillation activity are controlled by the rate of change in the integrated E region Pederson conductivity. It is, thus, shown that the occurrence maxima in scintillation activity at a given longitude coincide with times of the year when sunset is simultaneous at the conjugate E layers. The observed relationship is interpreted as support for the concept that equatorial irregularities are produced by the generalized gradient drift instability, driven by gravity and neutral wind, and by field-aligned currents which continue to flow during and after a rapid decay of the conjugate E layers.

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