Early time evolution of a chemically produced electron depletion

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dc.contributorVirginia Techen
dc.contributor.authorScales, Wayne A.en
dc.contributor.authorBernhardt, P. A.en
dc.contributor.authorGanguli, Gurudasen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessed2014-01-31en
dc.date.accessioned2014-02-05T14:20:25Zen
dc.date.available2014-02-05T14:20:25Zen
dc.date.issued1995-01-01en
dc.description.abstractThe early time evolution of an ionospheric electron depletion produced by a radially expanding electron attachment chemical release is studied with a two-dimensional simulation model. The model includes electron attachment chemistry, incorporates fluid electrons, particle ions and neutrals, and considers the evolution in a plane perpendicular to the geomagnetic field for a low beta plasma. Timescales considered are of the order of or less than the cyclotron period of the negative ions that result as a by-product of the electron attachment reaction. This corresponds to time periods of tenths of seconds during recent experiments. Simulation results show that a highly sheared azimuthal electron flow velocity develops in the radially expanding depletion boundary. This sheared electron flow velocity and the steep density gradients in the boundary give rise to small-scale irregularities in the form of electron density cavities and spikes. The nonlinear evolution of these irregularities results in trapping and ultimately turbulent heating of the negative ions.en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationScales, W. A., P. A. Bernhardt, and G. Ganguli (1995), Early time evolution of a chemically produced electron depletion, J. Geophys. Res., 100(A1), 269-280, doi:10.1029/94JA02490.en
dc.identifier.doihttps://doi.org/10.1029/94ja02490en
dc.identifier.issn0148-0227en
dc.identifier.urihttp://hdl.handle.net/10919/25320en
dc.identifier.urlhttp://onlinelibrary.wiley.com/doi/10.1029/94JA02490/pdfen
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectF-regionen
dc.subjectPlasmaen
dc.subjectInstabilityen
dc.subjectCloudsen
dc.subjectDrivenen
dc.subjectShearen
dc.titleEarly time evolution of a chemically produced electron depletionen
dc.title.serialJournal of Geophysical Research-Space Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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