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Estimating E region density profiles from radio occultation measurements assisted by IDA4D
Center for Geospace Studies, SRI International, Menlo Park, California, USA
Atmospheric & Space Technology Research Associates, San Antonio, Texas, USA
Atmospheric & Space Technology Research Associates, San Antonio, Texas, USA
Radio Observatorio de Jicamarca, Instituto Geofisico del Peru, Lima, Peru
An alternative approach for estimating E region density profiles using radio occultation total electron content (ROTEC) measurements is presented. In this approach, the F region contribution to the measured ROTEC is removed using the estimated F region from an assimilative model of ionospheric density. E region density profiles are then obtained from a numerical inversion of the residual ROTEC, which is assumed to be the E region contribution to the ROTEC. The proposed technique has been applied to radio occultation measurements made by the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC), while the F region specification is obtained from the Ionospheric Data Assimilation Four-Dimensional (IDA4D) algorithm. Examples of E region profiles obtained with this approach are presented and compared with nearby radar measurements at the magnetic equator. The results indicate that accurate estimates of the E region peak height and density can be obtained with this approach. This technique may be applicable to the estimation of E region conductivities with the global coverage provided by the radio occultation measurements.
Received 27 April 2009; accepted 23 July 2009; published 23 October 2009.
Citation: (2009), Estimating E region density profiles from radio occultation measurements assisted by IDA4D, J. Geophys. Res., 114, A10316, doi:10.1029/2009JA014399.
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