edu.ucar.opensky::articles:26628 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T19:25:28.517180 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d77m0czm Multiple longitude sector storm-enhanced density (SED) and long-lasting subauroral polarization stream (SAPS) during the 26–28 February 2023 geomagnetic storm 2023-09-01T00:00:00Z publication https://n2t.org/ark:/85065/d77m0czm https://doi.org/10.1029/2023JA031815 Aa, E. author Zhang, S. author Wang, Wenbin author Erickson, P. J. author Coster, A. J. author UCAR/NCAR - Library publisher This paper conducts a multi-instrument analysis and data assimilation study of midlatitude ionospheric disturbances over the European and North American longitude sectors during a strong geomagnetic storm on 26-28 February 2023. The study uses a set of ground-based (GNSS receivers, ionosondes) observations, space-borne (DMSP, GOLD) measurements, and a new TEC-based ionospheric data assimilation system (TIDAS). We observed a series of distinct storm-time features with regard to storm-enhanced density (SED) and subauroral polarization stream (SAPS) as follows: (a) Under multiple ring current intensifications, the storm-time subauroral ionosphere produced long-lasting duskside SAPS for similar to 36 hr along with considerable dawnside SAPS for several hours. (b) Associated with long-lived SAPS, strong SED occurred consecutively in the European longitude sector near local noon during a positive ionospheric storm and later in the North American longitude sector near local dusk during a negative ionospheric storm. (c) The 3-D morphology of SED in multiple longitude sectors was reconstructed using TIDAS data assimilation technique with fine-scale details, which revealed a narrow ionospheric plasma channel with electron density enhancement and layer uplift. 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 author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation