Accession Number : ADA114984
Title : Nonlinear Evolution of Convecting Plasma Enhancements in the Auroral Ionosphere II. Small Scale Irregularities.
Descriptive Note : Memorandum rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s) : Keskinen,M J ; Ossakow,S L
PDF Url : ADA114984
Report Date : 18 May 1982
Pagination or Media Count : 33
Abstract : The linear stability and nonlinear evolution of small scale density irregularities in local unstable regions of large scale convecting auroral plasma enhancements have been studied using analytical and numerical simulation techniques. Our results show that these small scale size irregularities are driven unstable primarily by the effects of convection and field aligned currents. Furthermore, we find that the density irregularities, in the nonlinear regime, in a plane nearly perpendicular to the magnetic field, resemble steepened striation-like structures (elongated in the north-south direction for equatorward convection) which can form and cascade from kilometer to tens of meter scale sizes on the order of an hour.
Descriptors : *Plasmas(Physics), *Convection(Atmospheric), *Ionosphere, Nonlinear systems, Aurorae, Evolution(General), Gradients, Drift, Stability, Linearity, Atmospheric density, Mathematical models, Equations of motion, Sizes(Dimensions), Scale, Magnetic fields
Subject Categories : Atmospheric Physics
Plasma Physics and Magnetohydrodynamics
Distribution Statement : APPROVED FOR PUBLIC RELEASE