Ionospheric responses to the 21 August 2017 solar eclipse by using data assimilation approach

Chia-Hung Chen, Charles Lin, Tomoko Matsuo

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Abstract

Using the physics-based thermosphere-ionosphere model (NCAR-TIEGCM) with an ensemble Kalman filter, this study reports the first data assimilative analysis of the ionosphere responses to the solar eclipse on 21 August 2017. The system, using a 2-min assimilation cycle of data from ground-based GNSS observations, show dynamic variations of the equatorial ionization anomaly (EIA) due to the electrodynamic effects of the solar eclipse. Two major ionospheric responses are captured: (1) an early appearance of EIA at the westward boundary of moon shadow and (2) an enhanced EIA at lower latitudes and suppressed EIA at the higher latitudes. These eclipse-induced conjugate EIA variations are produced by an eastward electric field perturbation around the magnetic equator and a westward electric field perturbation at the higher latitudes. [Figure not available: see fulltext.].

Original languageEnglish
Article number13
JournalProgress in Earth and Planetary Science
Volume6
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

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All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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