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- Title
Ionospheric responses to the 21 August 2017 solar eclipse by using data assimilation approach.
- Authors
Chen, Chia-Hung; Lin, Chien-Hung Charles; Matsuo, Tomoko
- 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.
- Subjects
IONOSPHERE; SOLAR eclipses; THERMOSPHERE; KALMAN filtering; ELECTRODYNAMICS
- Publication
Progress in Earth & Planetary Science, 2019, Vol 6, Issue 1, p1
- ISSN
2197-4284
- Publication type
Article
- DOI
10.1186/s40645-019-0263-4