INVESTIGADORES
GONZALEZ Alejandro Guillermo
artículos
Título:
The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with respect to the Flow
Autor/es:
A. G. GONZÁLEZ; J. GRATTON
Revista:
JOURNAL OF PLASMA PHYSICS
Editorial:
Cambridge University Press
Referencias:
Lugar: Cambridge; Año: 1994 vol. 51 p. 43 - 60
ISSN:
0022-3778
Resumen:
The
hydromagnetic Kelvin-Helmholtz instability is relevant in many complex
situations of astrophysical and laboratory plasmas. Many cases of
interest are very complicated, since they involve the combined role of
velocity shear, of density and magnetic field stratification, and of
various geometries in compressible plasmas. The present work is part of
a systematic investigation of the influence of the various physical and
geometrical parameters that characterize the plasma on the
Kelvin-Helmholtz modes. The general dispersion relation for the ideal
compressible MHD modes localized near a velocity discontinuity between
two uniform plasmas has been derived. The existence and characteristics
of the modes and their stability are studied analytically for any
relative orientation of B, u and k, for B and r continuous. We show that the stability of a given configuration cannot be guessed by considering only special orientations of k
(say flute or parallel modes). The present results may serve as a guide
to interpret results in more complicated and realistic situations as
those occurring in experiments and natural plasmas.
