MHD turbulence in the solar wind-comet interaction region

Details MHD turbulence in the solar wind-comet interaction region MHD turbulence in the solar wind-comet interaction region

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13...85s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Feb. 1986, p. 85-88.

Physics

124

Comets, Giacobini-Zinner Comet, Magnetohydrodynamic Turbulence, Solar Wind, Bow Waves, Heavy Ions, Shock Waves, Comets, Solar Wind, Interaction, Magnetohydrodynamics, Turbulence, Ions, Ice Mission, Spacecraft Observations, Giacobini-Zinner, Mass Loading, Distance, Analysis, Calculations, Magnetic Properties, Bow Shock

Scientific paper

A stability analysis and a quasi-linear analysis are used to show that the heavy ion loading of the solar wind excites intensive Alfven wave turbulence at distances up to a million km from a cometary nucleus. The amplitude of magnetic wave perturbations is of the order of the solar wind magnetic field, and the characteristic length of the detected perturbations is about 10,000 km. There is a collective pick-up of heavy ions by the solar wind in the direction parallel to the magnetic field, depending on the level of magnetic field fluctuations. This modifies the motion of the heavy ions in comparison to the ExH pick-up, and the result is an anisotropy of the bow shock position. In comparison to the usual planetary shock, the bow shock around comets is relatively weak and considerably spread out due to mass loading. This makes the bow shock difficult to detect over the large turbulent background.

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