Other
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ssrv...25....3e&link_type=abstract
Space Science Reviews, vol. 25, Jan. 1980, p. 3-34. Research supported by the United States-Israel Binational Science Foundation
Other
40
Comet Tails, Kelvin-Helmholtz Instability, Magnetohydrodynamic Waves, Solar Wind, Astronomical Models, Boundary Layer Plasmas, Compressible Fluids, Incompressible Fluids, Interplanetary Magnetic Fields, Magnetohydrodynamic Stability, Plasma Cylinders, Plasma Diagnostics, Plasma Waves, Transition Layers, Comets, Comet Tails, Solar Wind, Review, Models, Boundary Layers, Magnetic Fields, Waves, Amplitude, Plasmas, Magnetohydrodynamics, Data, Parameters, Analysis, Procedure, Phases, Velocity, Origin, Gradients,
Scientific paper
Selected problems of the solar wind-comet tail coupling that are currently accessible to quantitative analysis are reviewed. The model of a comet tail as a plasma cylinder separated by a tangential discontinuity surface from the solar wind is discussed in detail. This model is compatible with the well-known Alfven mechanism of formation of the comet tail. The stability problem of the comet tail boundary (considered as a discontinuity surface) is solved. Under typical conditions a comet tail boundary can undergo the Kelvin-Helmholtz instability. With finite amplitude the stabilizing effect of the magnetic field increases, and wave become stabilized. This model supplies a detailed quantitative description of helical waves observed in type-1 comet tails. A more general model of the tail boundary as a transition layer with a continuous change of the plasma parameters within it is also considered. This theory, in principle, enables the solution of one of the fundamental problems of cometary physics: the magnetic field of the comet tail can be derived from the observations of helical waves. This field turns out to be of the order of the interplanetary field. Various other considerations, discussed in this review, also support this conclusion.
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