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 finger-like 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 2-3 where P(k sub x) and P(k sub y) are the one-dimensional 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