On the occurrence of equatorial spread-F in the evening hours

Details On the occurrence of equatorial spread-F in the evening hours On the occurrence of equatorial spread-F in the evening hours

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..687r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, Aug. 1986, p. 687-693.

Physics

11

Equatorial Atmosphere, Ionospheric Drift, Ionospheric Electron Density, Spread F, Drift Rate, Electric Fields, Ionograms, Ionospheric Propagation, Night Sky

Scientific paper

By comparing electron drift velocities at Jicamarca with corresponding ionograms and VHF radio scintillation records at Huancayo it has been shown that the day-to-day variability in the occurrence of equatorial spread-F irregularities in the postsunset period depends critically on the time of reversal of the Sq electric field. The field reversal before sunset does not produce any spread-F in the evening hours, while the continuation of the daytime electric field for a couple of hours after sunset at normal strength is a favorable condition for generating spread-F.

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