edu.ucar.opensky::articles:15494 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:05:45.879949 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7kd1zz2 Theoretical study of new plasma structures in the low-latitude ionosphere during a major magnetic storm 2009-05-09T00:00:00Z publication https://n2t.org/ark:/85065/d7kd1zz2 https://doi.org/10.1029/2008JA013951 Lin, C. author Richmond, Arthur D. author Liu, J. author Bailey, G. author Reinisch, B. author UCAR/NCAR - Library publisher Theoretical model simulations for an intense magnetic storm show the creation of a low-latitude electron density arch aligned along the geomagnetic field created by strong uplift of the F₂ layer that is driven by the penetration electric field. When the arch forms during the day, a new F₂ layer is created at the original altitude by photoionization, and a density hole can be created between this new F₂ layer and the arch. When the arch forms during the night, the F₂ layer is not recreated and no hole forms. In a vertical profile of electron density, the daytime elevated ionospheric layer can appear distinctly from the recreated F₂ layer, in which case the elevated layer is called the F₃ layer. A latitude cut through the night-side arch shows the characteristics of an equatorial electron density trough, bounded to the north and south by enhanced densities associated with plasma that has diffused down along the geomagnetic field from the elevated layer. It is pointed out that the signature of the night-side arch has been seen in low Earth orbit spacecraft data, but has not been previously associated with an arch structure. 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 An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union. None eng geoscientificInformation