Affiliation:
1. Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China
2. Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518055, China
Abstract
The International Global Navigation Satellite Systems Service (IGS) ionospheric total electron content (TEC) data are used to study the periodic perturbation in the ionosphere during the 2019 Antarctic sudden stratospheric warming (SSW) event, a rare Southern Hemisphere minor SSW event in the last 40 years. A 14.5 day periodic signal with a zonal wavenumber of 0 is observed in the mesosphere and the lower thermosphere (MLT) region and the ionosphere during this SSW period, which could be related to the lunar tide. The 14.5 day periodic disturbance in the IGS TEC exhibits local time dependence and latitudinal variation, with the maximum amplitude appearing between 1000 and 1600 LT in the equatorial ionization anomaly (EIA) crest regions. Additionally, the 14.5 day periodic oscillation shows an obvious longitudinal variability, with the weakest amplitude appearing in the longitudinal region of 30° W–60° E.
Funder
National Natural Science Foundation of China
fellowship of China Postdoctoral Science Foundation
Foundation of National Key Laboratory of Electromagnetic Environment
Chinese Academy of Sciences
Key Laboratory of Geospace Environment
University of Science & Technology of China
Fundamental Research Funds for the Central Universities
Subject
Atmospheric Science,Environmental Science (miscellaneous)
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