Ionospheric electron density profiling and modeling of COSMIC follow-on simulations

L. C. Tsai, S. Y. Su, C. H. Liu, S. Tulasi Ram

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The FormoSat-3/ Constellation Observing System for Meteorology, Ionosphere and Climate (FS3/COSMIC) has been proven a successful mission on profiling ionospheric electron density Ne using the radio occultation (RO) technique. A follow-on program (called FS7/COSMIC2) is now in progress. The FS3/COSMIC follow-on mission will have six 24∘-inclination and 550-km low Earth orbiting (LEO) satellites and six 72∘-inclination and 750-km LEO satellites to receive Tri-G (GPS, GLONASS, and Galileo) satellite signals. FS7/COSMIC2 RO observations were simulated in this study by calculating limb-viewing GNSS-to-LEO TEC values separately through two independent ionospheric models (the TWIM and NeQuick models). We propose a compensatory Abel-inversion scheme to improve vertical Ne profiling and three-dimensional (3D) Ne modeling in this FS7/COSMIC2 simulation study with future real observations. In this FS7/COSMIC2 feasibility study the number of RO observations will increase of around 10 times compared with FS3/COSMIC, and the windowing day number to collect Ne profiles and to derive every half-hour 3D Ne model could be decreased from 30 to 3 days. The results show that the root-mean-square (RMS) foF2 and hmF2 difference improvements are 46 % (32 %) and 21 % (4.6 %), respectively, in relative percentage over the standard Abel inversion at the TWIM-background (NeQuick-background) simulation experiment. The RMS modeling errors are about one order less than those from FS3/COSMIC simulations.

Original languageEnglish
Pages (from-to)129-142
Number of pages14
JournalJournal of Geodesy
Issue number2
StatePublished - 1 Feb 2016


  • Ionospheric N modeling
  • Ionospheric N profiling
  • Radio occultation observation


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