Computer Science
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27.1239e&link_type=abstract
Planetary and Space Science, vol. 27, Oct. 1979, p. 1239-1245. Research supported by the United States-Israel Binational Science
Computer Science
2
Comet Tails, Magnetohydrodynamic Waves, Morehouse Comet, Nonuniform Plasmas, Plasma Waves, Boundary Layers, Magnetic Fields, Thickness, Transition Layers, Velocity Distribution, Wentzel-Kramer-Brillouin Method, Comets, Morehouse Comet, Comet Tails, Helical Waves, Models, Wavelengths, Thickness, Plasmas, Parameters, Magnetic Fields, Distance, Density, Pressure, Instability, Comparisons, Solar Wind
Scientific paper
Helical waves in the tail of comet Morehouse are studied in the WKB approximation with the plasma nonuniformity along the tail taken into account. A comet tail boundary is considered as a transition layer of thickness d, with the linear velocity profile within it. This approach enables one to set the limits of applicability of the tangential-discontinuity model. The thickness d of the tail boundary is derived from the observations of the increase of the wave amplitude along the tail axis: d is approximately 15,000 to 20,000 km. With such a thickness stability conditions turn out to be marginal. This could explain why helical waves in type 1 comet tails are seen only occasionally and not at all times.
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