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Experimental characterization of broadband electrostatic noise due to plasma compression


Metadata FieldValueLanguage
dc.contributorAmi DuBoisen_US
dc.creatorDuBois, Ami M.
dc.creatorThomas, Edward Jr.
dc.creatorAmatucci, William E.
dc.creatorGanguli, Gurudas
dc.date.accessioned2020-06-05T19:58:57Z
dc.date.available2020-06-05T19:58:57Z
dc.date.created2014-07
dc.identifier10.1002/2014JA020198en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2014JA020198en_US
dc.identifier.urihttp://hdl.handle.net/11200/49864
dc.description.abstractFor a wide variety of laboratory and space plasma environments, theoretical predictions state that plasmas are unstable to inhomogeneous flows over a very broad frequency range. Such sheared flows are generated in the Earth's magnetosphere and intensify during active periods. Specifically, for a velocity shear oriented perpendicular to a uniform background magnetic field, the shear scale length (L-E) compared to the ion gyroradius (rho(i)) determines the character of the shear-driven instability that may prevail. An interpenetrating plasma configuration is used to create a transverse velocity shear profile in a magnetized plasma column, a condition similar to that found in the natural boundary layers. The continuous variation of rho(i)/L-E and the associated transition of the instability regimes driven by the shear flow mechanism are demonstrated in a single laboratory experiment. Broadband wave emission correlated to increasing/decreasing stress (i.e., rho(i)/L-E), a characteristic signature of a boundary layer crossing, is found under controlled and repeatable conditions. This result holds out the promise for understanding the cause and effect of the in situ observation of broadband electrostatic noise.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.subjectSHEET BOUNDARY-LAYER; KELVIN-HELMHOLTZ INSTABILITY; SHEAR-DRIVEN INSTABILITIES; LOW-FREQUENCY OSCILLATIONS; TRANSVERSE VELOCITY SHEAR; ION-CYCLOTRON WAVES; ROTATING PLASMA; ELECTRIC-FIELDS; SOLITARY WAVES; LOBE BOUNDARYen_US
dc.titleExperimental characterization of broadband electrostatic noise due to plasma compressionen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume119en_US
dc.citation.issue7en_US
dc.citation.spage5624en_US
dc.citation.epage5637en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0003-0947-8038en_US
dc.creator.orcid0000-0002-7747-0284en_US

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