A comparison of ionospheric O+/light-ion transition height derived from ion-composition measurements and the topside ion density profiles over equatorial latitudes

Details A comparison of ionospheric O+/light-ion transition height derived from ion-composition measurements and the topside ion density profiles over equatorial latitudes A comparison of ionospheric O+/light-ion transition height derived from ion-composition measurements and the topside ion density profiles over equatorial latitudes

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720107t&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 20, CiteID L20107

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1

Ionosphere: Topside Ionosphere, Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Plasma Temperature And Density, Ionosphere: Modeling And Forecasting, Ionosphere: Electric Fields (2712)

Scientific paper

A comparative investigation is made, for the first time, of direct (ion-composition measurements) and indirect (from topside ion density profiles) methods to determine the O+/light-ion transition height over equatorial latitudes. The transition height determined from the ion-composition follows similar latitudinal and local time variations as the underlying Equatorial Ionization Anomaly (EIA) in the F-region ionosphere. The north-south hemispheric asymmetries in the transition height from ion composition are consistent with the summer-to-winter interhemispheric neutral wind patterns. On the other hand, the transition height derived from ion density profiles is chiefly influenced by changes in the scale height (shape) due to vertical E × B drift at the equator and steep vertical ion density gradients in topside ionosphere. As a result, the transition height derived from topside profiles are systematically lower and exhibit inconsistent latitudinal and local time variations when compared to direct ion-composition measurements at equatorial latitudes.

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