During periods of major geomagnetic storms the polar ionosphere becomes very variable. Ground-based measurements, such as NIMS, GPS or ionosonde data are too sparse to do tomographic imaging, however, combination of these data sources as well as other available measurements, such as satellitebased data, may have the possibility to monitor the structure of the disturbed polar ionosphere. In this paper, LEO-based GPS data onboard CHAMP as well as ground-based GPS ...
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