
Accession Number : ADA137132
Title : Nonlinear Theory of the E x B Instability with an Inhomogeneous Electric Field.
Descriptive Note : Memorandum rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s) : Keskinen,M J
PDF Url : ADA137132
Report Date : 09 Jan 1984
Pagination or Media Count : 38
Abstract : Using analytical and numerical techniques, the nonlinear evolution of the E x B instability with an inhomogeneous electric field has been studied. For the case where the electric field component parallel to the density gradient is inhomogeneous, the author finds that the inhomogenous E x B instability in the nonlinear regime (1) destabilizes short wavelength linear stable modes, (2) evolves into large scale anisotropic fingerlike structures, (3) can be described by power laws, P(k sub x) varies as k sub x (n)x, n sub x asymptotically equal 2, P(k sub y) varies as k sub y (n) sub y, n sub y asymptotically equal 23 where P(k sub x) and P(k sub y) are the onedimensional power spectra parallel and perpendicular to the initial density gradient and (4) can be stabilized by quasilinear mechanisms in which the initial density is modified by a finite amplitude wave spectrum. Applications are made both to naturally occurring small scale structures in the auroral ionosphere and striation formation in artificially produced ionospheric plasma clouds. (Author)
Descriptors : *Nonlinear analysis, *Electric fields, Mathematical models, Equations, Fluid flow, High latitudes, Ionosphere, Clouds, Plasmas(Physics), One dimensional, Power spectra
Subject Categories : Numerical Mathematics
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE