Abstract Possible occurrences of nonresonant Alfvén instabilities in solar system beam-plasmas include hydro-magnetic waves upstream of the Earth's bow shock, the parallel pick-up of interstellar neutrals by the solar wind and special type III radio bursts attributed to proton beams in solar coronal loops. For such two-beam models we use results from an earlier general multi-beam formalism, where Fowler's theorem for fluctuations in unstable plasmas is adapted in a novel way so as to obtain theoretical estimates for the magnetic field turbulence levels. Predicted levels of turbulence show that nonresonant Alfvén modes can indeed be one of the potential mechanisms which control the plasma and wave environment in the astrophysical regions concerned and which lead to the scattering of the ion beams and their ultimate assimilation into the solar wind or into the main coronal plasma.
Rôle of nonresonant Alfvén instabilities in solar system beam-plasmas
Advances in Space Research ; 11 , 9 ; 55-58
1991-01-01
4 pages
Article (Journal)
Electronic Resource
English
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