Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.133..203l&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 133, no. 2, 1987, p. 203-218.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Models, Comets, Low Frequencies, Plasma Turbulence, Plasma-Particle Interactions, Solar Wind, Giacobini-Zinner Comet, Halley'S Comet, Solitary Waves, Comets, Solar Wind, Low-Frequency, Plasma, Turbulence, Interaction, Electrostatic Effects, Stability, Halley, Alfven Waves, Amplitude, Ions, Distribution, Density, Models, Gases, Hydromagentics, Diagrams, Calculations, Protons, Electromagnetic Properties
Scientific paper
The pick up cometary ion distributions are shown to excite Alfvénic mode instabilities, slow ion-acoustic instability and a lower hybrid instability during solar wind-comet interaction. The growth rates of all these instabilities become larger as the comet is approached. The lower hybrid instability is shown to account for the low-frequency 0 - 300 Hz electrostatic turbulence observed near comet Halley. The Alfvén modes can grow to large amplitudes and become modulationally unstable, in the presence of low-frequency density fluctuations, going over to envelope Alfvén solitons. A model consisting of a gas of Alfvén solitons is suggested to explain the hydromagnetic turbulence observed near comet Halley and comet Giacobini-Zinner.
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