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Multifluid Block-Adaptive-Tree Solar Wind Roe-Type Upwind Scheme: Magnetospheric Composition and Dynamics During Geomagnetic Storms-Initial ResultsThe magnetosphere contains a significant amount of ionospheric O+, particularly during geomagnetically active times. The presence of ionospheric plasma in the magnetosphere has a notable impact on magnetospheric composition and processes. We present a new multifluid MHD version of the Block-Adaptive-Tree Solar wind Roe-type Upwind Scheme model of the magnetosphere to track the fate and consequences of ionospheric outflow. The multifluid MHD equations are presented as are the novel techniques for overcoming the formidable challenges associated with solving them. Our new model is then applied to the May 4, 1998 and March 31, 2001 geomagnetic storms. The results are juxtaposed with traditional single-fluid MHD and multispecies MHD simulations from a previous study, thereby allowing us to assess the benefits of using a more complex model with additional physics. We find that our multifluid MHD model (with outflow) gives comparable results to the multispecies MHD model (with outflow), including a more strongly negative Dst, reduced CPCP, and a drastically improved magnetic field at geosynchronous orbit, as compared to single-fluid MHD with no outflow. Significant differences in composition and magnetic field are found between the multispecies and multifluid approach further away from the Earth. We further demonstrate the ability to explore pressure and bulk velocity differences between H+ and O+, which is not possible when utilizing the other techniques considered
Document ID
20110010269
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Glocer, A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Toth, G.
(Michigan Univ. Ann Arbor, MI, United States)
Ma, Y.
(California Univ. Los Angeles, CA, United States)
Gombosi, T.
(Michigan Univ. Ann Arbor, MI, United States)
Zhang, J.-C.
(New Hampshire Univ. Durham, NH, United States)
Kistler, L. M.
(New Hampshire Univ. Durham, NH, United States)
Date Acquired
August 25, 2013
Publication Date
December 1, 2009
Publication Information
Publication: Journal of Geophysical Research
Publisher: American Geophysical Union
Volume: 114
ISSN: 0148-0227
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NNX07AP96G
CONTRACT_GRANT: NNX07AV80G
Distribution Limits
Public
Copyright
Other

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