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

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Title:	A comparison of ionospheric O(+)/light-ion transition height derived from ion-composition measurements and the topside ion density profiles over equatorial latitudes
Authors:	Ram,ST;Liu,CH;Su,SY;Heelis,RA
Contributors:	太空科學研究所
Keywords:	SCALE HEIGHT;SOUNDER DATA;MODEL;IRI
Date:	2010
Issue Date:	2012-03-27 17:29:37 (UTC+8)
Publisher:	國立中央大學
Abstract:	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 x 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. Citation: Tulasi Ram, S., C. H. Liu, S.-Y. Su, and R. A. Heelis (2010), A comparison of ionospheric O(+)/light-ion transition height derived from ion-composition measurements and the topside ion density profiles over equatorial latitudes, Geophys. Res. Lett., 37, L20107, doi:10.1029/2010GL045199.
Relation:	GEOPHYSICAL RESEARCH LETTERS
Appears in Collections:	[Graduate Institute of Space Science] journal & Dissertation

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