edu.ucar.opensky::articles:26695 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T19:21:05.883115 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d77m0d0g https://doi.org/10.5281/zenodo.7478785 https Related JournalArticle #1 Investigation of Interhemispheric Asymmetry of the Thermospheric Composition Observed by GOLD during the First Strong Geomagnetic Storm in Solar-Cycle 25, 1: IMF By Effects Investigation of interhemispheric asymmetry of the thermospheric composition observed by GOLD during the first strong geomagnetic storm in solar-cycle 25, 1: IMF By effects 2023-10-30T00:00:00Z publication https://n2t.org/ark:/85065/d77m0d0g https://doi.org/10.1029/2023JA031429 Yu, T. author Cai, X. author Ren, Z. author Wang, Z. author Pedatella, Nicholas M. author Jin, Y. author UCAR/NCAR - Library publisher An interhemispheric asymmetry of thermospheric Oxygen (O) to Nitrogen (N-2) column density ratio (Sigma O/N-2) variations was observed by the Global-scale Observations of the Limb and Disk (GOLD) during the 3-5 November 2021 geomagnetic storm. Sigma O/N-2 depletion is more equatorward in the local morning than in the local afternoon in the northern hemisphere (NH), while more equatorward in the local afternoon than the local morning in the southern hemisphere (SH). The Thermosphere Ionosphere Electrodynamics General Circulation Model simulations reproduced the observed Sigma O/N-2 asymmetry. The impacts of interplanetary magnetic field (IMF) east-west component (B-y) on the interhemispheric asymmetry of Sigma O/N-2 depletion was investigated. Comparisons of simulation results with and without real B-y show that the dominant positive IMF B-y results in the Joule heating maximum occurring in the local afternoon of NH and local morning in the SH during the storm initial phase, which generates the corresponding Sigma O/N-2 changes. Additionally, the IMF B-y during this storm are more crucial in the SH than in the NH. Without B-y, equatorward penetration of the Sigma O/N-2 depletion in GOLD Field of View are almost same in the SH. However, in the NH, there is still more equatorward depletion in the local morning than the local afternoon without B-y. 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 2023 American Geophysical Union (AGU). None eng geoscientificInformation