Nonlinear MHD theory of stationary moving structures and knoidal waves in auroral and magnetospheric plasmas: observations from Viking and search from Interball.

Details Nonlinear MHD theory of stationary moving structures and knoidal waves in auroral and magnetospheric plasmas: observations from Viking and search from Interball. Nonlinear MHD theory of stationary moving structures and knoidal waves in auroral and magnetospheric plasmas: observations from Viking and search from Interball.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..647v&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 647 - 656

Physics

1

Earth Magnetosphere: Aurorae, Earth Magnetosphere: Plasma, Earth Magnetosphere: Magnetohydrodynamics

Scientific paper

Measurements from the S3-3, Viking, Freja and FAST satellites in auroral and magnetospheric plasmas revealed various types of large amplitude, small-scale, moving plasma structures such as weak double layers, "ion holes", caviton-like and soliton-like features, and knoidal waves. In a series of papers in 1995 and 1997 the authors developed a nonlinear MHD theory of moving collisionless and collisional plasma structures of arbitrary amplitude which describes the waveforms and spatial and temporal evolution of such stationary and quasi-stationary small-scale structures. It was shown that such structures can exist in certain parameter ranges of auroral and magnetospheric plasmas. Their amplitudes, waveforms, and velocities were derived, and shown to be consistent with the characteristics of nonlinear plasma structures observed from Viking. The authors studied the stabilization of plasma instabilities and formation of stationary plasma structures as influenced by various physical processes in auroral and magnetospheric plasmas. The processes considered are collisions (in particular, Coulomb or effective collisions in turbulent plasmas), viscosity, dispersion, non-linearity, gradients of electron pressure, and ponderomotive force, their rôle in stabilization of instabilities and in the formation of stationary moving structures. Numerical modeling was made of some evolution scenarios of these processes in magnetospheric plasmas. Possibilities are discussed of detection and diagnostics of nonlinear quasi-stationary small-scale moving structures by the Interball satellites, and their comparisons with the theoretical models.

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