應用福衛七號GNSS掩星觀測資料於電離層氣象觀測與模式研究(1/3)

Project Details

Description

The FormoSat-3/ Constellation Observing System for Meteorology, Ionosphere and Climate (FS3/COSMIC) has been proven a successful mission on performing active limb sounding of the ionosphere using the GPS radio occultation (RO) technique. The follow-on program called FS7/COSMIC2 is in progress with proposed satellite launching in June of 2019. The electron density (Ne) values can be usually retrieved from the calibrated total electron content values using the Abel integral transform. We have developed a compensatory Abel-inversion scheme to improve vertical Ne profiling and also retrieved ionospheric parameters (foF2, hmF2, etc) for further three-dimensional Ne modeling. We also reprocess 1-Hz amplitude data and obtain complete limb-viewing profiles of the undersampling-S4 scintillation index to study global F-layer irregularity morphology. There are a few percent of FS3/COSMIC GPS RO observations having >0.09 undersampling S4max values on average. However, seven identified areas Central Pacific Area, South American Area, African Area, European Area, Japan Sea Area, Arctic Area and Antarctic Area have been designated to have a much higher percentage of strong limb-viewing L-band scintillations. Meanwhile, ionospheric tomography has also been studied using the Multiplicative Algebratic Reconstruction Technique (MART) on limb-viewing TECs. The FS3/COSMIC generally performed more than 1000 complete GPS RO observations per day, and the FS7/COSMIC2 constellation mission is designed for providing more than 5000 GPS/GLONASS RO observations per day and focusing on the regions between -50 and 50 latitude. Generally, 3D ionospheric Ne, F-layer scintillation and ionospheric weather and climatology, namely, its variations with each identified zone, altitude, season, and local time have been documented.
StatusFinished
Effective start/end date1/08/2031/07/21

Keywords

  • FS7/COSMIC2
  • FS3/COSMIC
  • GPS/GNSS radio occultation observation
  • ionospheric electron density
  • ionospheric tomography
  • ionospheric scintillation

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