Profiling of ionospheric electron density based on formosat-3/COSMIC Data: Results from the intense observation period experiment

Lung Chih Tsai, Chao Han Liu, Tung Yuan Hsiao

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35 Scopus citations

Abstract

Multi-channel Global Position System (GPS) carrier phase signals received by the FormoSat-3 (FS3)/COSMIC program's six low Earth orbiting (LEO) satellites were used to undertake active limb sounding of the Earth's atmosphere and ionosphere via radio occultation (RO). In this study. the effects of large-scale horizontal gradients and/or inhomogeneous ionospheric electron densities (ne) were considered by developing an iterative scheme to determine "compensated" total electron content (TEC) values through nearby occultation observations. Using an iterative Abel inversion through "compensated" TEC values. more than one-hundred and eighty thousand vertical ionospheric ne profdes were collected during the intense observation period (IOP) of 20 June - 27 September (day number 171 to 270) 2006. Coincidences of GPS RO observations to ionospheric ne ionosonde data from forty-nine worldwide stations have been examined. It is found that the iterative scheme gives improved retrievals over the standard Abel inversion. From several thousand matches within the IOP experiment. the root mean square (rms) foF2 differences between the ionosonde measurements and the FS3/COSMIC retrievals are improved from 1.67 to 1.07 MHz. The results also show improvement in the overestimates (underestimates) on low (high) retrieved foF2s. while the obtained hmF2s give better agreement with ionosonde observations.

Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume20
Issue number1
DOIs
StatePublished - Feb 2009

Keywords

  • Abel inversion
  • Electron density
  • Formosat-3/cosmic
  • Ionosphere
  • Radio occultation
  • Total electron content (TEC)

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