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dc.contributorVirginia Techen_US
dc.contributor.authorScales, Wayne A.en_US
dc.contributor.authorBernhardt, P. A.en_US
dc.contributor.authorGanguli, Gurudasen_US
dc.date.accessioned2014-02-05T14:20:24Z
dc.date.available2014-02-05T14:20:24Z
dc.date.issued1994-01-01
dc.identifier.citationScales, W. A., P. A. Bernhardt, and G. Ganguli (1994), Early time evolution of negative ion clouds and electron density depletions produced during electron attachment chemical release experiments, J. Geophys. Res., 99(A1), 373-381, doi:10.1029/93JA02752.
dc.identifier.issn0148-0227
dc.identifier.urihttp://hdl.handle.net/10919/25319
dc.description.abstractTwo-dimensional electrostatic particle-in-cell simulations are used to study the early time evolution of electron depletions and negative ion clouds produced during electron attachment chemical releases in the ionosphere. The simulation model considers the evolution in the plane perpendicular to the magnetic field and a three-species plasma that contains electrons, positive ions, and also heavy negative ions that result as a by-product of the electron attachment reaction. The early time evolution (less than the negative ion cyclotron period) of the system shows that a negative charge surplus initially develops outside of the depletion boundary as the heavy negative ions move across the boundary. The electrons are initially restricted from moving into the depletion due to the magnetic field. An inhomogenous electric field develops across the boundary layer due to this charge separation. A highly sheared electron flow velocity develops in the depletion boundary due to E X B and del N x B drifts that result from electron density gradients and this inhomogenous electric field. Structure eventually develops in the depletion boundary layer due to low-frequency electrostatic waves that have growth times shorter than the negative ion cyclotron period. It is proposed that these waves are most likely produced by the electron-ion hybrid instability that results from sufficiently large shears in the electron flow velocity.
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_US
dc.publisherAmerican Geophysical Union
dc.subjectF-regionen_US
dc.subjectPlasmaen_US
dc.subjectInstabilityen_US
dc.subjectIonosphereen_US
dc.subjectDynamicsen_US
dc.subjectFielden_US
dc.titleEarly time evolution of negative-ion clouds and electron-density depletions produced during electron-attachment chemical-release experimentsen_US
dc.typeArticle - Refereeden_US
dc.identifier.urlhttp://onlinelibrary.wiley.com/doi/10.1029/93JA02752/pdf
dc.date.accessed2014-01-31
dc.title.serialJournal of Geophysical Research-Space Physics
dc.identifier.doihttps://doi.org/10.1029/93ja02752
dc.type.dcmitypeTexten_US


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