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Comparison of COSMIC ionospheric measurements with ground-based observations and model predictions: Preliminary results
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA
COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA
Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA
Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA
Department of Earth and Atmospheric Science, Cornell University, Ithaca, New York, USA
Department of Earth and Atmospheric Science, Cornell University, Ithaca, New York, USA
National Space Organization, Hsinchu, Taiwan
Electron densities retrieved from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) radio occultation (RO) measurements are compared with those measured by incoherent scatter radars (ISR) and ionosondes in this paper. These results show that electron density profiles retrieved from COSMIC RO data are in agreement with the ISR and ionosonde measurements. The ionospheric characteristics (N mF2 and h mF2) derived from the COSMIC satellites are also compared with those calculated by the latest International Reference Ionosphere model (IRI-2001) and the National Center for Atmospheric Research Thermosphere-Ionosphere-Electrodynamics General Circulation Model (NCAR-TIEGCM). The comparison of the magnitude of the COSMIC N mF2 data with those calculated by the IRI model and the TIEGCM is good. However, features such as the north-south asymmetry and longitudinal variation of the equatorial anomaly that are seen in the COSMIC data and the TIEGCM simulations are not fully present in the IRI model. On the other hand, the TIEGCM produces a stronger winter anomaly than that seen in either the COSMIC data or the IRI model.
Received 22 December 2006; accepted 1 May 2007; published 25 July 2007.
Citation: (2007), Comparison of COSMIC ionospheric measurements with ground-based observations and model predictions: Preliminary results, J. Geophys. Res., 112, A07308, doi:10.1029/2006JA012240.
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