Low Frequency Oscillations in A Plasma with Spatially Variable Field-Aligned Flow

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dc.contributorVirginia Techen
dc.contributor.authorGanguli, Gurudasen
dc.contributor.authorSlinker, S.en
dc.contributor.authorGavrishchaka, V.en
dc.contributor.authorScales, Wayne A.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessed2014-03-20en
dc.date.accessioned2014-04-09T18:12:21Zen
dc.date.available2014-04-09T18:12:21Zen
dc.date.issued2002-05-01en
dc.description.abstractThe effects of a transverse gradient in the plasma flow velocity parallel to the ambient magnetic field are analyzed. A transverse velocity gradient in the parallel ion flow, even in small magnitude, can increase the parallel phase speed of the ion-acoustic waves sufficiently to reduce ion Landau damping. This results in a significantly lower threshold current for the current driven ion acoustic instability. Ion flow gradients can also give rise to a new class of ion cyclotron waves via inverse cyclotron damping. A broadband wave spectrum with multiple cyclotron harmonics is possible. A combination of the multiple cyclotron harmonic waves can result in spiky electric field structures with their peaks separated by an ion cyclotron period. A spatial gradient in the parallel electron flow is also considered but it is found to play a minimal role in the low frequency regime. Relevance of these to natural plasma environments is discussed. (C) 2002 American Institute of Physics.en
dc.description.sponsorshipOffice of Naval Researchen
dc.description.sponsorshipNASAen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGanguli, G.; Slinker, S.; Gavrishchaka, V.; Scales, W., "low frequency oscillations in a plasma with spatially variable field-aligned flow," Phys. Plasmas 9, 2321 (2002); http://dx.doi.org/10.1063/1.1445181en
dc.identifier.doihttps://doi.org/10.1063/1.1445181en
dc.identifier.issn1070-664Xen
dc.identifier.urihttp://hdl.handle.net/10919/47056en
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/pop/9/5/10.1063/1.1445181en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectIon-cyclotron instabilityen
dc.subjectTransverse electric-fieldsen
dc.subjectVelocity shearen
dc.subjectMagnetic fluidsen
dc.subjectElectrostatic-wavesen
dc.subjectAcoustic wavesen
dc.subjectAuroral regionen
dc.subjectSolar-winden
dc.subjectIonosphereen
dc.subjectCurrentsen
dc.titleLow Frequency Oscillations in A Plasma with Spatially Variable Field-Aligned Flowen
dc.title.serialPhysics of Plasmasen
dc.typeArticle - Refereeden
dc.typeConference proceedingen
dc.type.dcmitypeTexten

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