Equatorial spread and dynamics in the F layer over West Africa from ionogram analysis, during the declining solar flux year 1994-1995

Details Equatorial spread and dynamics in the F layer over West Africa from ionogram analysis, during the declining solar flux year 1994-1995 Equatorial spread and dynamics in the F layer over West Africa from ionogram analysis, during the declining solar flux year 1994-1995

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65.1309f&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 14-15, p. 1309-1314.

Physics

1

Equatorial Spread F, Ionosondes, Plasma Shear, Bubbles, Magnetic Equatorial Belt

Scientific paper

Equatorial spread-F (ESF) dynamics is studied based on quarter-hourly series of ionograms recorded in West Africa during the year December 1994 to November 1995. The time evolution of F layer at the typical equatorial site OUAGADOUGOU (Burkina Faso) differs slightly from that at DAKAR (Senegal), located at the northern edge of the magnetic equatorial belt. Comparing ESF occurrences at both stations with the pre-sunrise ones at FORTALEZA (Brazil), we find generally antisymmetric variations on both sides of the Atlantic, except for a common December solstice maximum. We stress the convergence of the multiple-scale morphologies drawn from new radars with those from high-quality ionosonde density (h',t) plots. This revives the analysis of ESF dynamics and points toward long-term network studies of ESF coupling phenomena.

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