The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification
Abstract This paper investigates the day‐to‐day global tidal variability in the ionosphere/thermosphere system due to fluctuations in the strength of the northern hemisphere stratospheric polar vortex. Using COSMIC‐2 (Constellation Observing System for Meteorology, Ionosphere, and Climate‐2) Global...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL111313 |
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| author | Deepali Aggarwal Jens Oberheide Nicholas Pedatella Benjamin C. Martinez |
| author_facet | Deepali Aggarwal Jens Oberheide Nicholas Pedatella Benjamin C. Martinez |
| author_sort | Deepali Aggarwal |
| collection | DOAJ |
| description | Abstract This paper investigates the day‐to‐day global tidal variability in the ionosphere/thermosphere system due to fluctuations in the strength of the northern hemisphere stratospheric polar vortex. Using COSMIC‐2 (Constellation Observing System for Meteorology, Ionosphere, and Climate‐2) Global Ionospheric Specification data, ionospheric tides are derived, with the Northern Annular Mode (NAM) index indicating polar vortex variability. The semidiurnal migrating solar tide shows the largest response, with relative electron density in the F‐region significantly higher (∼ 60%) under a weak vortex and lower (∼ 20%) under a strong vortex, correlated at −0.58 with the NAM index. The study compares solar/geomagnetic forcing and vortex impacts using SD‐WACCM‐X (Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension) model runs. Findings suggest tidal modulation of the E‐region dynamo as the coupling mechanism. Our study can potentially improve ionospheric space weather predictability because the NAM index can be known a few days in advance. |
| format | Article |
| id | doaj-art-4d46cc4067b7451eb5840328c8517ca1 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4d46cc4067b7451eb5840328c8517ca12025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL111313The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric SpecificationDeepali Aggarwal0Jens Oberheide1Nicholas Pedatella2Benjamin C. Martinez3Department of Physics and Astronomy Clemson University Clemson SC USADepartment of Physics and Astronomy Clemson University Clemson SC USAHigh Altitude Observatory National Center for Atmospheric Research Boulder CO USADepartment of Physics and Astronomy Clemson University Clemson SC USAAbstract This paper investigates the day‐to‐day global tidal variability in the ionosphere/thermosphere system due to fluctuations in the strength of the northern hemisphere stratospheric polar vortex. Using COSMIC‐2 (Constellation Observing System for Meteorology, Ionosphere, and Climate‐2) Global Ionospheric Specification data, ionospheric tides are derived, with the Northern Annular Mode (NAM) index indicating polar vortex variability. The semidiurnal migrating solar tide shows the largest response, with relative electron density in the F‐region significantly higher (∼ 60%) under a weak vortex and lower (∼ 20%) under a strong vortex, correlated at −0.58 with the NAM index. The study compares solar/geomagnetic forcing and vortex impacts using SD‐WACCM‐X (Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension) model runs. Findings suggest tidal modulation of the E‐region dynamo as the coupling mechanism. Our study can potentially improve ionospheric space weather predictability because the NAM index can be known a few days in advance.https://doi.org/10.1029/2024GL111313ionosphereE‐region dynamoatmospheric tidespolar vortexvertical couplingshort‐term variability |
| spellingShingle | Deepali Aggarwal Jens Oberheide Nicholas Pedatella Benjamin C. Martinez The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification Geophysical Research Letters ionosphere E‐region dynamo atmospheric tides polar vortex vertical coupling short‐term variability |
| title | The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification |
| title_full | The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification |
| title_fullStr | The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification |
| title_full_unstemmed | The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification |
| title_short | The Semidiurnal Tidal Response of the Low Latitude Ionosphere to Northern Hemisphere Polar Vortex Strength (2020–2023) From COSMIC‐2 Global Ionospheric Specification |
| title_sort | semidiurnal tidal response of the low latitude ionosphere to northern hemisphere polar vortex strength 2020 2023 from cosmic 2 global ionospheric specification |
| topic | ionosphere E‐region dynamo atmospheric tides polar vortex vertical coupling short‐term variability |
| url | https://doi.org/10.1029/2024GL111313 |
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