Ionospheric tilting of 21 August 2017 total solar eclipse sounded by GNSS ground-based receivers and radio occultation

  • Author(s): Chi-Yen Lin, Jann-Yenq Liu, Yang-Yi Sun, Charles Chien-Hung Lin, Loren C. Chang, Chao-Yen Chen, and Chia-Hung Chen
  • DOI: 10.3319/TAO.2021.08.17.01
  • Keywords: GNSS Total electron content Ionosphere Radio occultation Solar eclipse
  • Citation: Lin, C.-Y., J.-Y. Liu, Y.-Y. Sun, C. C.-H. Lin, L. C. Chang, C.-Y. Chen, and C.-H. Chen, 2021: Ionospheric tilting of 21 August 2017 total solar eclipse sounded by GNSS groundbased receivers and radio occultation. Terr. Atmos. Ocean. Sci., 32, 531-539, doi: 10.3319/TAO.2021.08.17.01
  • A TEC double-peaked feature is recorded during the 21 August 2017 solar eclipse
  • The experiment indicates the tilted ionosphere results in the double-peaked feature
  • The double-peaked feature can only detect under a particular position

A total solar eclipse passed over the continental United States from the west to the east coast on 21 August 2017. Measurements made by more than 2200 groundbased GNSS (Global Navigation Satellite System) receivers observed a significant decrease in ionospheric total electron content (TEC). Meanwhile, radio occultation soundings from the LEMUR2-LYNSEY-SYMO satellite record a double-peaked feature in the scanned TEC profile. A reproduction of the double-peaked feature on the TEC profile shows that the solar eclipse depresses the electron density and simultaneously tilts the ionosphere. This study, in turn, indicates the combination of the International Reference Ionosphere model and the GNSS TEC is a powerful tool for observing ionospheric space weather.

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