Twilight and night-time representations of foE for the IRI

Details Twilight and night-time representations of foE for the IRI Twilight and night-time representations of foE for the IRI

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..105b&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 3, p. 105-113.

Physics

1

E Region, Ionospheric Electron Density, Ionospheric Propagation, Night Sky, Solar Radiation, Critical Frequencies, Eiscat Radar System (Europe)

Scientific paper

The critical frequency of the E-layer is related approximately to the solar-zenith angle, but there is evidence of important relaxation effects at twilight with the dawn and dusk periods differing and there is also a remnant night-time ionosphere. This paper reviews available information on the diurnal variation of monthly median foE with particular emphasis on the twilight and night-time. It notes empirical formulations in use within the CCIR and IRI, presents sample data obtained from the EISCAT incoherent-scatter radar and considers the bases for adjustment of some existing internationally adopted relationships.

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