Spread-F and ionization anomaly belt

Details Spread-F and ionization anomaly belt Spread-F and ionization anomaly belt

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..371a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, May 1989, p. 371-379.

Physics

11

Ionograms, Ionospheric Electron Density, Magnetic Equator, Spread F, Tropical Regions, Equatorial Atmosphere, Night Sky, Panama

Scientific paper

The present investigation attempts to bring out the dynamics of the F-region at magnetic equatorial and low latitudes in the American zone. Data are examined for two sets of nights, one with strong range-type spread at Huancayo, another with complete absence of spread-F. A prominent bulge of the F-region was observed within and below a latitude 10 N in the evening hours of the spread-F nights. Contours of electron distribution during post-sunset hours at the equatorial latitude, Huancayo, low latitude, Talara, and a location near the anomaly crest location, Panama, indicated a much steeper gradient in electron density at fixed heights on spread-F nights compared to a rather low gradient on the nonspread-F nights. Enhanced concentration of electrons at the anomaly crest location Panama, and a lower density at the equatorial location Huancayo, were observed on spread-F present nights. This is attributed to the phenomena of an evening plasma fountain in operation at equatorial latitudes on spread-F nights.

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