edu.ucar.opensky::articles:22796 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:29:40.434303 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d79g5qzw What do the new 2018 HIWIND thermospheric wind observations tell us about high-latitude ion-neutral coupling during daytime? 2019-07-18T00:00:00Z publication https://n2t.org/ark:/85065/d79g5qzw https://doi.org/10.1029/2019JA026776 Wu, Qian author Knipp, Delores J. author Liu, Jing author Wang, Wenbin author Häggström, I. author Jee, G. author Kwak, Y. author Erickson, P. J. author UCAR/NCAR - Library publisher Daytime thermospheric winds observed by the balloon-borne instrument HIWIND (High-altitude Interferometer WIND experiment) during two flights in June 2011 and 2018 from Kiruna (68 degrees N, 20 degrees E), along with simultaneous European Incoherent SCATter radar ion drift data, are analyzed. National Center for Atmospheric Research TIEGCM (Thermosphere Ionosphere Electrodynamics General Circulation Model) simulations for both flights are compared with observations. The observed thermospheric winds from the two flights have many similarities. HIWIND-observed thermospheric winds tend to be equatorward during the morning hours before noon and close to zero in the afternoon. In contrast, TIEGCM predicts poleward winds before noon and near zero in the afternoon. Southward interplanetary magnetic field B-z, occurring as the balloon passed through morning, was associated with greater equatorward meridional winds. The TIEGCM-simulated zonal winds have large differences with observations under more active conditions. The second HIWIND flight confirms some important results from the first flight and further shows thermospheric wind variations under different interplanetary magnetic field conditions. HIWIND observations in general provide invaluable data for model validation and highlight deficiencies in current high-latitude simulations. 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