Nonlinear Theory of the E x B Instability with an Inhomogeneous Electric Field.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 09, 1984
- Accession Number
- ADA137132
Entities
People
- Michael J. Keskinen
Organizations
- United States Naval Research Laboratory