TY - JOUR
T1 - Lunar Tide Effects on Ionospheric Solar Eclipse Signatures
T2 - The August 21, 2017 Event as an Example
AU - Liu, Jann Yenq
AU - Wu, Tsung Yu
AU - Sun, Yang Yi
AU - Pedatella, Nicholas M.
AU - Lin, Chi Yen
AU - Chang, Loren C.
AU - Chiu, Yi Chung
AU - Lin, Chien Hung
AU - Chen, Chia Hung
AU - Chang, Fu Yuan
AU - Lee, I. Te
AU - Chao, Chi Kuang
AU - Krankowski, Andrzej
N1 - Funding Information:
The authors gratefully acknowledge the International GNSS Service (IGS) (http://garner.ucsd.edu/) and Continuously Operating Reference Station (CORS) (https://geodesy.noaa.gov/CORS/data.shtml) for providing the ground-based GNSS data. This study is supported by the Taiwan Ministry of Science and Technology (MOST) grant MOST 108-2119-M-008-001 and the ISSI-Bern International Team of “Ionospheric Space Weather Studied by RO and Ground-based GNSS TEC Observations” (the team leader Liu, J. Y. Tiger [TW]). Andrzej Krankowski acknowledges financial support from Ministry of Science and Higher Education (MSHE), Poland (MSHE decision no. DIR/WK/2016/2017/05-1 and decision no. 59/E-383/SPUB/SP/2019.1) and the National Centre for Research and Development, Poland (decision no. DWM/PL-CHN/97/2019, WPC1/ARTEMIS/2019).
Funding Information:
The authors gratefully acknowledge the International GNSS Service (IGS) ( http://garner.ucsd.edu/ ) and Continuously Operating Reference Station (CORS) ( https://geodesy.noaa.gov/CORS/data.shtml ) for providing the ground‐based GNSS data. This study is supported by the Taiwan Ministry of Science and Technology (MOST) grant MOST 108‐2119‐M‐008‐001 and the ISSI‐Bern International Team of “Ionospheric Space Weather Studied by RO and Ground‐based GNSS TEC Observations” (the team leader Liu, J. Y. Tiger [TW]). Andrzej Krankowski acknowledges financial support from Ministry of Science and Higher Education (MSHE), Poland (MSHE decision no. DIR/WK/2016/2017/05‐1 and decision no. 59/E‐383/SPUB/SP/2019.1) and the National Centre for Research and Development, Poland (decision no. DWM/PL‐CHN/97/2019, WPC1/ARTEMIS/2019).
Publisher Copyright:
© 2020. American Geophysical Union. All Rights Reserved.
PY - 2020/12
Y1 - 2020/12
N2 - The ionospheric total electron content (TEC) derived from dense ground-based Global Navigation Satellite System receivers over the continental United States and those from global ionosphere maps are utilized to find the ionosphere response to the August 21, 2017 total solar eclipse. Maximum obscurations and their associated TEC major depressions appear simultaneously at midlatitudes, while major depressions elongate toward the magnetic equator with some delays in the equatorial ionization anomaly (EIA) region. The former is due to the photochemical loss process, while the latter is caused by the plasma transport of E×B drifts and lunar gravitation forces. TECs of predawn reductions, morning enhancements, afternoon reductions, and nighttime enhancements reveal that the semidiurnal lunar tide are essential. Since a solar eclipse always occurs on a new moon day, the lunar tide results in the early EIA appearance and major depressions being underestimated/diminished before and overestimated/enhanced after about 14:00 local time.
AB - The ionospheric total electron content (TEC) derived from dense ground-based Global Navigation Satellite System receivers over the continental United States and those from global ionosphere maps are utilized to find the ionosphere response to the August 21, 2017 total solar eclipse. Maximum obscurations and their associated TEC major depressions appear simultaneously at midlatitudes, while major depressions elongate toward the magnetic equator with some delays in the equatorial ionization anomaly (EIA) region. The former is due to the photochemical loss process, while the latter is caused by the plasma transport of E×B drifts and lunar gravitation forces. TECs of predawn reductions, morning enhancements, afternoon reductions, and nighttime enhancements reveal that the semidiurnal lunar tide are essential. Since a solar eclipse always occurs on a new moon day, the lunar tide results in the early EIA appearance and major depressions being underestimated/diminished before and overestimated/enhanced after about 14:00 local time.
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U2 - 10.1029/2020JA028472
DO - 10.1029/2020JA028472
M3 - Article
AN - SCOPUS:85098050600
SN - 2169-9402
VL - 125
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
IS - 12
M1 - e2020JA028472
ER -