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

Chia-Hung Chen, Charles Lin, Tomoko Matsuo

Research output: Contribution to journalArticle

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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solar eclipse
data assimilation
ionization
anomaly
electric field
ionosphere
perturbation
GNSS
electrodynamics
thermosphere
Kalman filter
Moon
physics

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

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title = "Ionospheric responses to the 21 August 2017 solar eclipse by using data assimilation approach",
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.].",
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Ionospheric responses to the 21 August 2017 solar eclipse by using data assimilation approach. / Chen, Chia-Hung; Lin, Charles ; Matsuo, Tomoko.

In: Progress in Earth and Planetary Science, Vol. 6, No. 1, 13, 01.12.2019.

Research output: Contribution to journalArticle

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