Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 17, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL100369
Keywords
F-region tides; tidal weather; sudden stratospheric warmings; Northern Annual Mode; polar vortex; COSMIC-2
Categories
Funding
- NASA [80NSSC22K1010, 80NSSC22K0018]
- NSF [2149695]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [2149695] Funding Source: National Science Foundation
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The semidiurnal tidal spectrum in the F-region ionosphere is significantly enhanced during the January 2021 Sudden Stratospheric Warming (SSW) according to the hourly COSMIC-2 Global Ionospheric Specification (GIS) data assimilation. The response of the semidiurnal migrating tidal in topside electron densities closely follows the day-to-day changes of the 10 hPa, 60 degrees N zonal wind from MERRA-2 during the SSW. This study provides new insights into space weather variability driven by lower and middle atmosphere dynamics through the analysis of COSMIC-2 GIS data, which is the first data set to resolve the tidal weather of the ionosphere on a day-to-day basis.
The semidiurnal tidal spectrum in the F-region ionosphere obtained from hourly COSMIC-2 Global Ionospheric Specification (GIS) data assimilation is greatly (>50%) enhanced during the January 2021 Sudden Stratospheric Warming (SSW). Moreover, the semidiurnal migrating tidal response in topside electron densities closely follows the day-to-day changes of the 10 hPa, 60 degrees N zonal wind from MERRA-2 during the SSW. The response is similar in the northern and southern crests of the Equatorial Ionization Anomaly (EIA) but persists toward higher magnetic latitudes and the EIA trough. A slight phase shift toward earlier local times is consistent with theoretical expectations of an E-region dynamo driving and agrees with semidiurnal tidal diagnostics of MIGHTI/ICON zonal winds at 105 km. COSMIC-2 GIS are the first data set to resolve the tidal weather of the ionosphere on a day-to-day basis and, therefore, provide a new perspective on space weather variability driven by lower and middle atmosphere dynamics.
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