edu.ucar.opensky::articles:23569 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:05:51.593802 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7z89gpr Early morning equatorial ionization anomaly from GOLD observations 2020-07-09T00:00:00Z publication https://n2t.org/ark:/85065/d7z89gpr https://doi.org/10.1029/2019JA027487 Laskar, F. I. author Eastes, R. W. author Martinis, C. R. author Daniell, R. E. author Pedatella, Nicholas M. author Burns, Alan author McClintock, W. author Goncharenko, L. P. author Coster, A. author Milla, M. A. author Wang, Wenbin author Valladares, C. E. author Codrescu, M. V. author UCAR/NCAR - Library publisher During geomagnetically quiet and solar minimum conditions, spatial variations of the early morning thermosphere-ionosphere (TI) system are expected to be mainly governed by wave dynamics. To study the postmidnight dynamical coupling, we investigated the early morning equatorial ionization anomaly (EIA) using Global-scale Observations of the Limb and Disk (GOLD) measurements of OI-135.6 nm nightglow emission and global navigation satellite system (GNSS)-based total electron content (TEC) maps. The EIA structures in the OI-135.6 nm emission over the American landmass resemble, spatially and temporally, those observed in the GNSS-TEC maps. The early morning EIA (EM-EIA) crests are well separated in latitude and mostly located over the middle of South America during October-November. In February-April the crests are less separated in latitude and predominantly located over the west coast sector of South America. Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension (WACCMX) simulations with constant solar minimum and quiet-geomagnetic conditions show that EM-EIA can occur globally and shows properties similar to longitudinal Wave 4 pattern. Thus, we propose that EM-EIA is driven by dynamical changes associated with the lower atmospheric waves. 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 2020 American Geophysical Union. None eng geoscientificInformation