Comparison of COSMIC ionospheric measurements with ground-based observations and model predictions: Preliminary results

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Read Full Article (file size: 970916 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, A07308, doi:10.1029/2006JA012240, 2007 Comparison of COSMIC ionospheric measurements with ground-based observations and model predictions: Preliminary results Jiuhou Lei High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA Stig Syndergaard COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA Alan G. Burns High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA Stanley C. Solomon High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA Wenbin Wang High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA Zhen Zeng High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA Raymond G. Roble High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA Qian Wu High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA Ying-Hwa Kuo COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA John M. Holt Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA Shun-Rong Zhang Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA David L. Hysell Department of Earth and Atmospheric Science, Cornell University, Ithaca, New York, USA Fabiano S. Rodrigues Department of Earth and Atmospheric Science, Cornell University, Ithaca, New York, USA Chien H. Lin National Space Organization, Hsinchu, Taiwan Abstract 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. Index Terms: 2487 Ionosphere: Wave propagation (0689, 3285, 4275, 4455, 6934); 2494 Ionosphere: Instruments and techniques; 2447 Ionosphere: Modeling and forecasting; 2437 Ionosphere: Ionospheric dynamics. Read Full Article (file size: 970916 bytes) Cited by Citation: Lei, J., et al. (2007), Comparison of COSMIC ionospheric measurements with ground-based observations and model predictions: Preliminary results, J. Geophys. Res., 112, A07308, doi:10.1029/2006JA012240. Copyright 2007 by the American Geophysical Union.

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