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• W4376875101 abstract "Abstract This study focuses on understanding what drives the previously observed deep nighttime ionospheric hole in the American sector during the January 2013 sudden stratospheric warming (SSW). Performing a set of numerical experiments with the thermosphere‐ionosphere‐mesosphere‐electrodynamics general circulation model (TIME‐GCM) constrained by a high‐altitude version of the Navy Global Environmental Model, we demonstrate that this nighttime ionospheric hole was the result of increased poleward and down magnetic field line plasma motion at low and midlatitudes in response to altered F ‐region neutral meridional winds. Thermospheric meridional wind modifications that produced this nighttime depletion resulted from the well‐known enhancements in semidiurnal tidal amplitudes associated with stratospheric warming (SSWs) in the upper mesosphere and thermosphere. Investigations into other deep nighttime ionospheric depletions and their cause were also considered. Measurements of total electron content from Global Navigation Satellite System receivers and additional constrained TIME‐GCM simulations showed that nighttime ionospheric depletions were also observed on several nights during the January‐February 2010 SSW, which resulted from the same forcing mechanisms as those observed in January 2013. Lastly, the recent January 2021 SSW was examined using Modern‐Era Retrospective Analysis for Research and Applications, Version 2, COSMIC‐2 Global Ionospheric Specification electron density, and ICON Michelson Interferometer for Global High‐Resolution Thermospheric Imaging horizontal wind data and revealed a deep nighttime ionospheric depletion in the American sector was likely driven by modified meridional winds in the thermosphere. The results shown herein highlight the importance of thermospheric winds in driving nighttime ionospheric variability over a wide latitude range." @default.
• W4376875101 created "2023-05-18" @default.
• W4376875101 creator A5003778430 @default.
• W4376875101 creator A5007974825 @default.
• W4376875101 creator A5033439121 @default.
• W4376875101 creator A5043549221 @default.
• W4376875101 creator A5055903854 @default.
• W4376875101 creator A5061042360 @default.
• W4376875101 creator A5066533681 @default.
• W4376875101 creator A5068885146 @default.
• W4376875101 creator A5070424884 @default.
• W4376875101 date "2023-05-25" @default.
• W4376875101 modified "2023-10-17" @default.
• W4376875101 title "Understanding Nighttime Ionospheric Depletions Associated With Sudden Stratospheric Warmings in the American Sector" @default.
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