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Assessing the role of oxygen on ring current formation and evolution through numerical experiments
dc.contributor.authorIlie, R.en_US
dc.contributor.authorLiemohn, M. W.en_US
dc.contributor.authorToth, G.en_US
dc.contributor.authorYu Ganushkina, N.en_US
dc.contributor.authorDaldorff, L. K. S.en_US
dc.date.accessioned2015-08-05T16:47:23Z
dc.date.available2016-07-05T17:27:58Zen
dc.date.issued2015-06en_US
dc.identifier.citationIlie, R.; Liemohn, M. W.; Toth, G.; Yu Ganushkina, N.; Daldorff, L. K. S. (2015). "Assessing the role of oxygen on ring current formation and evolution through numerical experiments." Journal of Geophysical Research: Space Physics 120(6): 4656-4668.en_US
dc.identifier.issn2169-9380en_US
dc.identifier.issn2169-9402en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/112251
dc.description.abstractWe address the effect of ionospheric outflow and magnetospheric ion composition on the physical processes that control the development of the 5 August 2011 magnetic storm. Simulations with the Space Weather Modeling Framework are used to investigate the global dynamics and energization of ions throughout the magnetosphere during storm time, with a focus on the formation and evolution of the ring current. Simulations involving multifluid (with variable H+/O+ ratio in the inner magnetosphere) and single‐fluid (with constant H+/O+ ratio in the inner magnetosphere) MHD for the global magnetosphere with inner boundary conditions set either by specifying a constant ion density or by physics‐based calculations of the ion fluxes reveal that dynamical changes of the ion composition in the inner magnetosphere alter the total energy density of the magnetosphere, leading to variations in the magnetic field as well as particle drifts throughout the simulated domain. A low oxygen to hydrogen ratio and outflow resulting from a constant ion density boundary produced the most disturbed magnetosphere, leading to a stronger ring current but misses the timing of the storm development. Conversely, including a physics‐based solution for the ionospheric outflow to the magnetosphere system leads to a reduction in the cross‐polar cap potential (CPCP). The increased presence of oxygen in the inner magnetosphere affects the global magnetospheric structure and dynamics and brings the nightside reconnection point closer to the Earth. The combination of reduced CPCP together with the formation of the reconnection line closer to the Earth yields less adiabatic heating in the magnetotail and reduces the amount of energetic plasma that has access to the inner magnetosphere.Key PointsLow O+/H+ ratio produced stronger ring currentInclusion of physics‐based ionospheric outflow leads to a reduction in the CPCPOxygen presence is linked to a nightside reconnection point closer to the Earthen_US
dc.publisherAGUen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otheroutflowen_US
dc.subject.otherring currenten_US
dc.subject.otherMHDen_US
dc.subject.otherpolar winden_US
dc.subject.othercompositionen_US
dc.titleAssessing the role of oxygen on ring current formation and evolution through numerical experimentsen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAstronomy and Astrophysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/112251/1/jgra51856.pdf
dc.identifier.doi10.1002/2015JA021157en_US
dc.identifier.sourceJournal of Geophysical Research: Space Physicsen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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