Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30wssc3s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 23, pp. SSC 3-1, CiteID 2192, DOI 10.1029/2003GL018266
Physics
4
Interplanetary Physics: Energetic Particles, Planetary, Interplanetary Physics: Mhd Waves And Turbulence, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Mhd Waves And Instabilities
Scientific paper
The resonant excitation of right-hand polarized waves by an ion beam propagating parallel to the ambient magnetic field is a well-known effect of linear dispersion theory. In this paper, stationary nonlinear structures in such a beam-plasma system are studied on the basis of Hall-MHD description. Soliton-like structures with superimposed spatial oscillations have been found which arise from the momentum coupling between the main plasma population and the beam ions via the LF electromagnetic field. They have similar signatures as the recently described oscillitons of linearly stable two-ion plasmas [Sauer et al., 2001] where effective momentum coupling may happen in the vicinity of their cross-over frequencies. Our message is that gyrophase-bunched ions seen upstream of the Earth's bow shock in association with ULF wave packets may find an explanation by oscillitons in a beam-plasma system.
Dubinin Edik
Sauer Ken
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