Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7359d&link_type=abstract
Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7359-7364.
Physics
Diurnal Variations, Equatorial Atmosphere, Ionospheric Electron Density, Satellite Tracking, Vertical Distribution, Atmospheric Models, E Region, Electron Density Profiles, F Region, Sunspots, Ultraviolet Radiation
Scientific paper
The diurnal variations of electron content and shape factor observed at an equatorial station during sunspot minimum are shown to be consistent with the electron density profiles observed at Jicamarca during sunspot minimum. The rapid increase in electron content and the shape factor at sunrise results from the EUV production of ionization in the E and F regions. Day-to-day variations in daytime electron content are observed to be quite small at the equator. The evening decrease in the shape factor results from an upward drift of the F region at sunset and the evening decay of the E and bottomside F regions. The nighttime peak or plateau in the shape factor is produced by the slow downward drift of the electron density profile. The deep predawn dip in the shape factor is caused by the main peak of the F layer reaching low altitudes where high loss rates cause a large reduction in ionization below 300 km and very flat electron density profile.
Anderson Dale N.
Davies Kenneth
Donnelly Richard F.
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