The morphology of equatorial Mg/plus/ ion distribution deduced from 2800-A airglow observations

Details The morphology of equatorial Mg/plus/ ion distribution deduced from 2800-A airglow observations The morphology of equatorial Mg/plus/ ion distribution deduced from 2800-A airglow observations

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5249g&link_type=abstract

Journal of Geophysical Research, vol. 84, Sept. 1, 1979, p. 5249-5258. Research supported by the Fonds National de la Recherche

Physics

4

Airglow, Equatorial Atmosphere, Ionospheric Ion Density, Magnesium, Metal Ions, Diurnal Variations, Emission Spectra, Explorer 17 Satellite, F Region, Resonance Scattering, Ultraviolet Spectroscopy, Vertical Distribution

Scientific paper

The Visible Airglow Experiment on the Atmosphere Explorer E satellite has observed the resonantly scattered emission from Mg II at 2800 A in the equatorial ionosphere. Altitude profiles of the Mg(plus) ion distribution have been obtained from the inversion of the surface brightness measurements made on spinning orbits. These data show a daytime metallic ion layer between 150 and 200 km developing in the early morning and reaching about 100 ions/cu cm in the afternoon. Mg(plus) ions are also seen in the F 2 region mostly in the late afternoon hours within a few degrees of the dip equator. The study of the vertical column density measured in the despun mode indicates that the amount of Mg(plus) in the F region is most variable in the afternoon hours at low dip latitudes. These results can be explained in part by the diurnal variation of the E x B drift velocity which lifts the metallic ions up into the F region. The observations suggest that the vertical polarization electric field is not the primary transport mechanism extracting the Mg(plus) ions from the low-altitude source layer.

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