edu.ucar.opensky::articles:42360 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T17:57:36.891365 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d78s4v80 https://doi.org/10.5281/zenodo.1214206 https Related Software #1 aburrell/apexpy: ApexPy Version 2.1.0 https://doi.org/10.5281/zenodo.7818719 https Related Software #2 aburrell/apexpy: ApexPy Version 2.0.1 The semidiurnal tidal response of the low latitude ionosphere to northern hemisphere polar vortex strength (2020-2023) from COSMIC‐2 global ionospheric specification 2025-01-01T00:00:00Z publication https://n2t.net/ark:/85065/d78s4v80 https://doi.org/10.1029/2024GL111313 Aggarwal, D. author Oberheide, J. author Pedatella, Nicholas M. author Martinez, B. C. author UCAR/NCAR - Library publisher This paper investigates the day&#8208;to&#8208;day global tidal variability in the ionosphere/thermosphere system due to fluctuations in the strength of the northern hemisphere stratospheric polar vortex. Using COSMIC&#8208;2 (Constellation Observing System for Meteorology, Ionosphere, and Climate&#8208;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&#8208;region significantly higher ( 60%) under a weak vortex and lower ( 20%) under a strong vortex, correlated at &#8722;0.58 with the NAM index. The study compares solar/geomagnetic forcing and vortex impacts using SD&#8208;WACCM&#8208;X (Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension) model runs. Findings suggest tidal modulation of the E&#8208;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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <style type="text/css"></style><span style="font-family:Arial;font-size:10pt;font-style:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span> None eng geoscientificInformation