Storm-Time Meridional Flows: A Comparison of CINDI Observations and Model Results

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Storm-Time Meridional Flows: A Comparison of CINDI Observations and Model Results

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title Storm-Time Meridional Flows: A Comparison of CINDI Observations and Model Results
contributor.author Hairston, Marc R.
contributor.author Maruyama, N.
contributor.author Coley, William R.
contributor.author Stoneback, Russell A.
description.abstract During a large geomagnetic storm, the electric field from the polar ionosphere can expand far enough to affect the mid-latitude and equatorial electric fields. These changes in the equatorial zonal electric field, called the penetration field, will cause changes in the meridional ion flows that can be observed by radars and spacecraft. In general this E x B ion flow near the equator caused by the penetration field during undershielding conditions will be upward on the dayside and downward on the nightside of the Earth. Previous analysis of the equatorial meridional flows observed by CINDI instrument on the C/NOFS spacecraft during the 26 September 2011 storm showed that all of the response flows on the dayside were excess downward flows instead of the expected upward flows. These observed storm-time responses are compared to a prediction from a physics-based coupled model of thermosphere-ionosphere- inner-magnetosphere in an effort to explain these observations. The model results suggest that the equatorial downward flow could be attributed to a combined effect of the overshielding and disturbance dynamo processes. However, some discrepancy between the model and observation indicates a need for improving our understanding of how sensitive the equatorial electric field is to various model input parameters that describe the magnetosphere-ionosphere coupling processes.
description.sponsorship The work at the University of Texas at Dallas was supported by NASA grant NNX10AT02G. Work by N. Maruyama was supported by NASA grant NNX09AN58G and by US National Science Foundation grants AGS 1042258 and AGS 1103149.
identifier.issn 1432-0576
identifier.uri http://hdl.handle.net/10735.1/4149
identifier.bibliographicCitation Hairston, M., N. Maruyama, W. R. Coley, and R. Stoneback. 2014. "Storm-time meridional flows: A comparison of CINDI observations and model results." Annales Geophysicae 32(6): 659-668.
identifier.volume 32
identifier.issue 6
subject Polar cap
subject Ionosphere
subject Meridional ion flows
subject Geomagnetism
date.created 2014-06-17
date.issued 2014-06-17
publisher Copernicus Gmbh
relation.uri http://dx.doi.org/10.5194/angeo-32-659-2014
rights CC-BY 3.0 (Attribution)
rights ©2014 The Authors
rights.uri http://creativecommons.org/licenses/by/3.0/legalcode
language.iso en
source Annales Geophysicae

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CC-BY 3.0 (Attribution) Except where otherwise noted, this item's license is described as CC-BY 3.0 (Attribution)