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Ionospheric tomography based on GNSS observations of the CMONOC: performance in the topside ionosphere

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Abstract

This study carries out a quantitative analysis of the performance of ionospheric tomography in the topside ionosphere, utilizing data of October 2011 collected from 260 Global Navigation Satellite System (GNSS) stations in the Crustal Movement Observation Network of China. This tomographic reconstruction with a resolution of 2° in latitude, 2° in longitude and 20 km in altitude has more than 70 % of voxels traversed by GPS raypaths and is able to provide reliable bottom parts of ionospheric profiles. Compared with the observations measured by the Defense Meteorological Satellite Program (DMSP) satellites (F16, F17 and F18) at an altitude of 830–880 km, the results show that there is an overestimation in the reconstructed plasma density at the DMSP altitude, and the reconstruction is better during daytime than nighttime. In addition, the reconstruction at nighttime also indicates a solar activity and latitudinal dependence. In summary, with respect to DMSP measurements, the daytime bias is on average from −0.32 × 105/cm3 to −0.28 × 105/cm3, while the nighttime bias is between −0.37 × 105/cm3 and −0.24 × 105/cm3, and the standard deviation at daytime and at nighttime is, respectively, 0.082 × 105/cm3 to 0.244 × 105/cm3 and 0.086 × 105/cm3 to 0.428 × 105/cm3. This study suggests that vertical ionospheric profiles from other sources, such as ionosondes or GNSS occultation satellites, should be incorporated into ground-based GNSS topside tomographic studies.

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Acknowledgments

The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 10603011, 11273048, 41474131, 11403083), Shanghai Natural Science Foundation (Grant Nos. 13ZR1446900) and the National Key Special Program of China. Also, the authors would like to thank data center of the Crustal Movement Observation Network of China and the international GNSS Monitoring & Assessment Service (iGMAS) of China for providing GNSS data, the IGS for making the GPS data available, the NOAA’s National Geophysical Data Center (NGDC) for providing the DMSP SSIES data and the COSMIC Data Analysis and Archived Centre (CDAAC) for providing the COSMIC data. The anonymous reviewers are thanked for their constructive comments which helped greatly in improving the paper.

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Authors and Affiliations

  1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China

    Zhe Yang, Shuli Song, Junchen Xue, Weili Zhou & Wenyao Zhu

  2. Beijing Institute of Tracking and Telecommunication Technology, Beijing, China

    Wenhai Jiao

  3. Science and Technology on Aerospace Flight Dynamics Laboratory, Beijing Aerospace Control Center, Beijing, China

    Guangming Chen

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  1. Zhe Yang
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  2. Shuli Song
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  3. Wenhai Jiao
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  4. Guangming Chen
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  5. Junchen Xue
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  6. Weili Zhou
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  7. Wenyao Zhu
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Correspondence to Zhe Yang or Shuli Song.

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Yang, Z., Song, S., Jiao, W. et al. Ionospheric tomography based on GNSS observations of the CMONOC: performance in the topside ionosphere. GPS Solut 21, 363–375 (2017). https://doi.org/10.1007/s10291-016-0526-0

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