Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3042w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3042-3060.
Physics
77
Kelvin-Helmholtz Instability, Magnetopause, Magnetospheric Instability, Space Plasmas, Boundary Value Problems, Density Distribution, Flow Velocity, Kinetic Energy, Magnetohydrodynamics, Pressure Distribution
Scientific paper
An MHD model is defined for the convective Kelvin-Helmholtz instability (CKHI) which satellite data indicates produces vortices in the near-earth region of the plasma sheet through turbulence caused by shear flow. The MHD equations are solved as an initial value problem, which reveals that the CKHI growth rate is the same as that of the periodic KHI (PKHI). However, the CKHI is not as limited in the range of amplitude as is the PKHI, which experiences stability in nonlinear growth because of the periodic characteristics of the growth. A perpendicularly moving CKHI can produce a large vortex flow and shocks off the vortex boundary. The satellite data indicate that the vortices are in the size range of 10-20 earth radii. Additional effects can include the expulsion of magnetic flux and the formation of the boundary layer. The success of the model up to the point of formation of the boundary layer is taken as an incentive for further model development using more realistic magnetospheric data.
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