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First assimilations of COSMIC radio occultation data into the Electron Density Assimilative Model (EDAM)

Standard techniques for inverting GPS radio occultation measurements contain limiting assumptions; i.e. spherical symmetry and co-planar orbits are both assumed. This paper demonstrates how these limitations may be overcome through the use of on assimilative ionospheric model. The greatest benefits arise from a combined assimilation of ground and space based data. However, it is also demonstrated that some information on the vertical structure of the ionosphere can be extracted from the ground based measurements alone. This research was conducted at QinetiQ and was funded by the Operating Environment domain of the UK MOD Corporate Science and Technology programme.