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Nighttime Ionosphere Perturbed by the Annular Solar Eclipse on June 21, 2020
Author(s) -
Sun YangYi,
Chen ChiehHung,
Qing Haiyin,
Xu Rui,
Su Xiaoning,
Jiang Chunhua,
Yu Tao,
Wang Jin,
Xu Huiru,
Lin Kai
Publication year - 2021
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2021ja029419
Subject(s) - tec , solar eclipse , ionosonde , sunset , ionosphere , total electron content , daytime , eclipse , terminator (solar) , noon , atmospheric sciences , gnss applications , meteorology , geology , environmental science , geodesy , satellite , physics , electron density , geophysics , astronomy , plasma , quantum mechanics
This study analyzed the total electron content (TEC) observed by 337 ground‐based Global Navigation Satellite System (GNSS) receivers over China and South Asia, the critical frequency of the ionospheric F 2 layer ( f o F 2 ) and its height ( h m F 2 ) recorded by the ionosonde at Puer (22.7°N, 101.05°E, 72% obscuration), Yunnan province, during and after the annular solar eclipse on June 21, 2020. The observations show that the eclipse induced not only a daytime major depression but also nighttime perturbations in the ionosphere. The TEC perturbed intermittently from noon to midnight between 85° and 125°E on the eclipse day. The positive and negative changes of the prereversal enhancement respectively occur in the nearby longitudinal sectors of 100°and 115°E. The TEC perturbations behave as a terminator wave that propagates in a northwestward direction after sunset.