edu.ucar.opensky::articles:22595 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:34:54.703825 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d78k7d5b Revisiting the modulations of ionospheric solar and lunar migrating tides during the 2009 stratospheric sudden warming by using Global Ionosphere Specification 2019-05-01T00:00:00Z publication https://n2t.org/ark:/85065/d78k7d5b https://doi.org/10.1029/2019SW002184 Lin, J. T. author Lin, C. H. author Lin, C. Y. author Pedatella, Nicholas M. author Rajesh, P. K. author Matsuo, T. author Liu, J. Y. author UCAR/NCAR - Library publisher In this study, Global Ionosphere Specification (GIS) based on Gauss-Markov Kalman filter assimilation of slant total electron content observed from ground-based global positioning system receivers and space-based radio occultation instrumentations is applied to investigate the ionospheric day-to-day tidal variability during the 2009 stratospheric sudden warming (SSW) period. Including the improved daily three-dimensional global electron density distribution from GIS enables us to retrieve the daily solar tidal solution by using least squares tidal analysis. We find prominent reductions followed by enhancements in the amplitude of the solar semidiurnal migrating tide (SW2) after the peak warming, with recurrent phase variations occurring at low magnetic latitudes over a period of about 15 days. This is close to the beating period (15.13 day) between SW2 and lunar semidiurnal (M2), thus suggesting the existence of strong M2, and our results demonstrate that the intensification of M2 exists only during the SSW period. Additionally, M2 acts as the key contributor to make the semidiurnal ionospheric perturbations shift toward later local times. Our tidal analyses of daily GIS thus provide evidence for the combined impact of amplitudes and phases of the SW2 and M2 in producing semidiurnal variations in ionosphere during the 2009 SSW. 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 Copyright 2019 American Geophysical Union. None eng geoscientificInformation