Wave Steepening in Ionospheric Total Electron Density due to the 21 August 2017 Total Solar Eclipse

Yang Yi Sun, Mitchell M. Shen, Yu Lin Tsai, Chi Yen Lin, Min Yang Chou, Tao Yu, Kai Lin, Qian Huang, Jin Wang, Lihui Qiu, Chieh Hung Chen, Jann Yenq Liu

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1 Scopus citations

Abstract

This study shows that a supersonic moon shadow of a total solar eclipse can steepen the ionospheric total electron content (TEC) wave on August 21, 2017. A data-adaptive method named Hilbert-Huang transform is employed to examine the nonlinear and non-stationary evolution of the waves. The results show that the TEC wave behaves as a traveling ionospheric disturbance before the totality appearance, turns later into steepening, and breaks eventually. A TEC wave with a period of ∼40 min and wavelength of ∼1,000 km propagates mainly in an east-southward direction before the totality appearance. The wave amplitude and scales, respectively, increases and reduce by near ∼50% as the moon shadow approaches the western coast of the continental United States. The short-period TEC waves (period ∼2 min) reveal that the wave may break eventually when the wave gets steeper. The steepness of the TEC wave is reconstructed according to the constructive interference.

Original languageEnglish
Article numbere2020JA028931
JournalJournal of Geophysical Research: Space Physics
Volume126
Issue number3
DOIs
StatePublished - Mar 2021

Keywords

  • GNSS
  • nonlinear wave
  • solar eclipse
  • total electron content
  • wave break
  • wave steepening

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