期刊
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fspas.2023.1198739
关键词
SSW; day-to-day variability; ionosphere perturbation; atmosphere-ionosphere coupling; atmosphere tides
This report examines the ground-based total electron content (TEC) in Asian sector during August-October 2019, with a focus on the period of a stratosphere sudden warming (SSW) occurred in Antarctica. The study reveals pronounced ionospheric day-to-day variability with distinct periodicities, including quasi-10 day, quasi-14 day, and quasi-6 day oscillations. The findings demonstrate that low-level geomagnetic activities and mesospheric wind changes during the SSW have significant impacts on TEC, which should not be ignored when studying meteorological effects on the ionosphere.
This brief report examines the ground-based total electron content (TEC) in Asian sector during August-October 2019, covering the period of a stratosphere sudden warming (SSW) occurred in Antarctica. The analysis reveals pronounced ionospheric day-to-day variability with distinct periodicities. The most dominant and long-lasting periodicities are quasi-10 days and quasi 14-day during September and October, while a quasi 6-day also present in September. The 10-day and 6-day TEC oscillations were attributed by previous studies solely to the Antarctic SSW while assuming negligible geomagnetic effects. By comparing co-located ground mesospheric wind observations, along with the interplanetary electric field (IEF) and geomagnetic activity (Kp index), we demonstrate that the quasi 14-day oscillation is mainly driven by low-level geomagnetic activities, while quasi-6 days oscillation is driven by mesospheric wind changes during the SSW. The 10-day oscillation, on the other hand, is driven by both IEF and mesospheric wind in September, but by IEF in October. These results demonstrate that low-level geomagnetic activities traditionally classified as quiet conditions can induce significant day-to-day oscillations in TEC, and their impacts should not be ignored when studying meteorological (e.g., SSWs) impacts on the ionosphere.
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