Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138..209v&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 138, no. 1, Nov. 1987, p. 209-215. FNRS-supported research.
Physics
5
Bow Waves, Comet Tails, Magnetohydrodynamic Waves, Plasma Turbulence, Solar Wind, Electromagnetic Fields, Electron Energy, Halley'S Comet, Plasmas (Physics)
Scientific paper
The large differences in drift velocities between the solar wind protons and the picked-up ions of cometary origin cause the Alfvén waves to become unstable and generate turbulence. A self-consistent treatment of such instabilities has to take into account that these cometary ions affect the solar wind plasma in a decisive way. With the help of a previously developed formalism one finds the correct Alfvén instability criterion, which is here nondispersive, in contrast to recent calculations where the cometary ions are treated as a low-density, high-speed, and non-neutral beam through an otherwise undisturbed solar wind. The true bulk speed of the combined solar wind plus cometary ion plasma clearly shows the mass-loading and deceleration of the solar wind near the cometary nucleus, indicating a bow shock. The instability criterion is also used to determine the region upstream where the Alfvén waves can be unstable, based upon recent observations near comet Halley.
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