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 language | English |
|---|---|
| Article number | 13 |
| Journal | Progress in Earth and Planetary Science |
| Volume | 6 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2019 Dec 1 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)
Cite this
}
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 journal › Article
TY - JOUR
T1 - Ionospheric responses to the 21 August 2017 solar eclipse by using data assimilation approach
AU - Chen, Chia-Hung
AU - Lin, Charles
AU - Matsuo, Tomoko
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.].
AB - 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.].
UR - http://www.scopus.com/inward/record.url?scp=85061040832&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061040832&partnerID=8YFLogxK
U2 - 10.1186/s40645-019-0263-4
DO - 10.1186/s40645-019-0263-4
M3 - Article
VL - 6
JO - Progress in Earth and Planetary Science
JF - Progress in Earth and Planetary Science
SN - 2197-4284
IS - 1
M1 - 13
ER -