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The cooperative IGS RT-GIMs: a reliable estimation of the global ionospheric electron content distribution in real time
Earth System Science Data ( IF 11.4 ) Pub Date : 2021-09-23 , DOI: 10.5194/essd-13-4567-2021 Qi Liu , Manuel Hernández-Pajares , Heng Yang , Enric Monte-Moreno , David Roma-Dollase , Alberto García-Rigo , Zishen Li , Ningbo Wang , Denis Laurichesse , Alexis Blot , Qile Zhao , Qiang Zhang , André Hauschild , Loukis Agrotis , Martin Schmitz , Gerhard Wübbena , Andrea Stürze , Andrzej Krankowski , Stefan Schaer , Joachim Feltens , Attila Komjathy , Reza Ghoddousi-Fard
Earth System Science Data ( IF 11.4 ) Pub Date : 2021-09-23 , DOI: 10.5194/essd-13-4567-2021 Qi Liu , Manuel Hernández-Pajares , Heng Yang , Enric Monte-Moreno , David Roma-Dollase , Alberto García-Rigo , Zishen Li , Ningbo Wang , Denis Laurichesse , Alexis Blot , Qile Zhao , Qiang Zhang , André Hauschild , Loukis Agrotis , Martin Schmitz , Gerhard Wübbena , Andrea Stürze , Andrzej Krankowski , Stefan Schaer , Joachim Feltens , Attila Komjathy , Reza Ghoddousi-Fard
The Real-Time Working Group (RTWG) of the International GNSS Service (IGS) is
dedicated to providing high-quality data and high-accuracy products for Global
Navigation Satellite System (GNSS) positioning, navigation, timing and Earth
observations. As one part of real-time products, the IGS combined Real-Time
Global Ionosphere Map (RT-GIM) has been generated by the real-time weighting
of the RT-GIMs from IGS real-time ionosphere centers including the Chinese
Academy of Sciences (CAS), Centre National d'Etudes Spatiales (CNES),
Universitat Politècnica de Catalunya (UPC) and Wuhan University
(WHU). The performance of global vertical total electron content (VTEC)
representation in all of the RT-GIMs has been assessed by VTEC from
Jason-3 altimeter for 3 months over oceans and dSTEC-GPS technique with
2 d observations over continental regions. According to the
Jason-3 VTEC and dSTEC-GPS assessment, the real-time weighting technique is
sensitive to the accuracy of RT-GIMs. Compared with the performance of
post-processed rapid global ionosphere maps (GIMs) and IGS combined final GIM
(igsg) during the testing period, the accuracy of UPC RT-GIM (after the
improvement of the interpolation technique) and IGS combined RT-GIM (IRTG) is
equivalent to the rapid GIMs and reaches around 2.7 and 3.0 TECU (TEC unit,
1016 el m−2) over
oceans and continental regions, respectively. The accuracy of CAS RT-GIM and
CNES RT-GIM is slightly worse than the rapid GIMs, while WHU RT-GIM requires a
further upgrade to obtain similar performance. In addition, a strong
response to the recent geomagnetic storms has been found in the global
electron content (GEC) of IGS RT-GIMs (especially UPC RT-GIM and IGS combined
RT-GIM). The IGS RT-GIMs turn out to be reliable sources of real-time global
VTEC information and have great potential for real-time applications including
range error correction for transionospheric radio signals, the monitoring of
space weather, and detection of natural hazards on a global scale. All the IGS
combined RT-GIMs generated and analyzed during the testing period are
available at https://doi.org/10.5281/zenodo.5042622 (Liu et al., 2021b).
更新日期：2021-09-23
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