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Global ionosphere map constructed by using total electron content from ground-based GNSS receiver and FORMOSAT-3/COSMIC GPS occultation experiment

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Abstract

Effects of rapidly changing ionospheric weather are critical in high accuracy positioning, navigation, and communication applications. A system used to construct the global total electron content (TEC) distribution for monitoring the ionospheric weather in near-real time is needed in the modern society. Here we build the TEC map named Taiwan Ionosphere Group for Education and Research (TIGER) Global Ionospheric Map (GIM) from observations of ground-based GNSS receivers and space-based FORMOSAT-3/COSMIC (F3/C) GPS radio occultation observations using the spherical harmonic expansion and Kalman filter update formula. The TIGER GIM (TGIM) will be published in near-real time of 4-h delay with a spatial resolution of 2.5° in latitude and 5° in longitude and a high temporal resolution of every 5 min. The F3/C TEC results in an improvement on the GIM of about 15.5%, especially over the ocean areas. The TGIM highly correlates with the GIMs published by other international organizations. Therefore, the routinely published TGIM in near-real time is not only for communication, positioning, and navigation applications but also for monitoring and scientific study of ionospheric weathers, such as magnetic storms and seismo-ionospheric anomalies.

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Acknowledgments

This study is supported by the grant of Ministry of Science and Technology to National Central University, MOST 104-2628-M-008-001, to National Cheng Kung University, MOST 105-2111-M-006-004, and the ISSI-Bern International Team of “Ionospheric Space Weather Studied by RO and Ground-based GNSS TEC Observations” (the team leader Liu J. Y. (TW)). The authors gratefully acknowledge Taiwan Analysis Center for COSMIC (TACC) for providing the near-real-time GNSS TEC data, as well as CDAAC and TACC for publishing F3/C RO data, and NASA/JPL for providing the OSTM/Jason-2 data (ftp://podaac-ftp.jpl.nasa.gov/allData/ostm/). The authors would like to thank the reviewers for their comments that help improve the paper.

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Authors and Affiliations

  1. Graduate Institute of Space Science, National Central University, Taoyuan, Taiwan

    Yang-Yi Sun & Jann-Yenq Liu

  2. Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan

    Ho-Fang Tsai

  3. Space Radio-Diagnostics Research Centre, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

    Andrzej Krankowski

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  1. Yang-Yi Sun
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  2. Jann-Yenq Liu
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  3. Ho-Fang Tsai
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  4. Andrzej Krankowski
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Correspondence to Jann-Yenq Liu.

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Sun, YY., Liu, JY., Tsai, HF. et al. Global ionosphere map constructed by using total electron content from ground-based GNSS receiver and FORMOSAT-3/COSMIC GPS occultation experiment. GPS Solut 21, 1583–1591 (2017). https://doi.org/10.1007/s10291-017-0635-4

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