Eigenmode analysis of compressional poloidal modes in a self‐consistent magnetic field

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dc.citation.firstpage10,369
dc.citation.issueNumber10
dc.citation.journalTitleJournal of Geophysical Research: Space Physics
dc.citation.lastpage10,381
dc.citation.volumeNumber122
dc.contributor.authorXia, Zhiyang
dc.contributor.authorChen, Lunjin
dc.contributor.authorZheng, Liheng
dc.contributor.authorChan, Anthony A.
dc.date.accessioned2018-07-02T18:19:42Z
dc.date.available2018-07-02T18:19:42Z
dc.date.issued2017
dc.description.abstractIn this study, we simulate a self‐consistent magnetic field that satisfies force balance with a model ring current that is radially localized, axisymmetric, and has anisotropic plasma pressure. We find that the magnetic field dip forms near the high plasma pressure region with plasma β >∼ 0.6, and the formed magnetic dip becomes deeper for larger plasma βand also slightly deeper for larger anisotropy. We perform linear analysis on a ppol of self‐consistent equilibria for second harmonic compressional poloidal modes of sufficiently high azimuthal wave number. We investigate the effect of anisotropic pressure on the eigenfrequency of the poloidal modes and the characteristics of the compressional magnetic field component. We find that the eigenfrequency is reduced at the outer edge of the thermal pressure peak and increased at the inner edge. The compressional magnetic field component occurs primarily within 10° of the equator on both the inner and outer edges, with stronger compressional magnetic field component on the outer edge. Larger β and smaller anisotropy can increase the change of eigenfrequency and the strength of the compressional magnetic field component. The critical condition on plasma β and pressure anisotropy of an Alfvén ballooning instability is also identified.
dc.identifier.citationXia, Zhiyang, Chen, Lunjin, Zheng, Liheng, et al.. "Eigenmode analysis of compressional poloidal modes in a self‐consistent magnetic field." <i>Journal of Geophysical Research: Space Physics,</i> 122, no. 10 (2017) Wiley: 10,369-10,381. https://doi.org/10.1002/2017JA024376.
dc.identifier.doihttps://doi.org/10.1002/2017JA024376
dc.identifier.urihttps://hdl.handle.net/1911/102326
dc.language.isoeng
dc.publisherWiley
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleEigenmode analysis of compressional poloidal modes in a self‐consistent magnetic field
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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