Global MHD modeling of resonant ULF waves: Simulations with and without a plasmasphere

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dc.citation.firstpage227en_US
dc.citation.issueNumber1en_US
dc.citation.journalTitleJournal of Geophysical Research: Space Physicsen_US
dc.citation.lastpage244en_US
dc.citation.volumeNumber121en_US
dc.contributor.authorClaudepierre, S.G.en_US
dc.contributor.authorToffoletto, F.R.en_US
dc.contributor.authorWiltberger, M.en_US
dc.date.accessioned2017-05-22T18:57:18Z
dc.date.available2017-05-22T18:57:18Z
dc.date.issued2016en_US
dc.description.abstractWe investigate the plasmaspheric influence on the resonant mode coupling of magnetospheric ultralow frequency (ULF) waves using the Lyon-Fedder-Mobarry (LFM) global magnetohydrodynamic (MHD) model. We present results from two different versions of the model, both driven by the same solar wind conditions: one version that contains a plasmasphere (the LFM coupled to the Rice Convection Model, where the Gallagher plasmasphere model is also included) and another that does not (the stand-alone LFM). We find that the inclusion of a cold, dense plasmasphere has a significant impact on the nature of the simulated ULF waves. For example, the inclusion of a plasmasphere leads to a deeper (more earthward) penetration of the compressional (azimuthal) electric field fluctuations, due to a shift in the location of the wave turning points. Consequently, the locations where the compressional electric field oscillations resonantly couple their energy into local toroidal mode field line resonances also shift earthward. We also find, in both simulations, that higher-frequency compressional (azimuthal) electric field oscillations penetrate deeper than lower frequency oscillations. In addition, the compressional wave mode structure in the simulations is consistent with a radial standing wave oscillation pattern, characteristic of a resonant waveguide. The incorporation of a plasmasphere into the LFM global MHD model represents an advance in the state of the art in regard to ULF wave modeling with such simulations. We offer a brief discussion of the implications for radiation belt modeling techniques that use the electric and magnetic field outputs from global MHD simulations to drive particle dynamics.en_US
dc.identifier.citationClaudepierre, S.G., Toffoletto, F.R. and Wiltberger, M.. "Global MHD modeling of resonant ULF waves: Simulations with and without a plasmasphere." <i>Journal of Geophysical Research: Space Physics,</i> 121, no. 1 (2016) Wiley: 227-244. http://dx.doi.org/10.1002/2015JA022048.
dc.identifier.doihttp://dx.doi.org/10.1002/2015JA022048en_US
dc.identifier.urihttps://hdl.handle.net/1911/94339
dc.language.isoengen_US
dc.publisherWiley
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/us/en_US
dc.subject.keywordfield line resonanceen_US
dc.subject.keywordglobal MHD simulationen_US
dc.subject.keywordplasmasphereen_US
dc.subject.keywordradiation beltsen_US
dc.subject.keywordresonant ULF wave couplingen_US
dc.subject.keywordwaveguideen_US
dc.titleGlobal MHD modeling of resonant ULF waves: Simulations with and without a plasmasphereen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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