High amplitude magnetosonic waves in the upstream region of the cometary bow-shock

Details High amplitude magnetosonic waves in the upstream region of the cometary bow-shock High amplitude magnetosonic waves in the upstream region of the cometary bow-shock

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..546k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 546-552.

Statistics

Computation

8

Bow Waves, Comets, Magnetoelastic Waves, Magnetohydrodynamic Turbulence, Shock Waves, Computational Astrophysics, Landau Damping, Magnetosonic Resonance, Wave Excitation, Comets, Bow Shock, Amplitude, Upstream, Magnetohydrodynamics, Density, Turbulence, Ions, Distribution, Calculations, Refraction, Velocity, Diffusion, Damping, Protons, Theoretical Studies, Parameters, Intensity, Resonance, Solar Wind, Numerical Methods

Scientific paper

The MHD turabulence usually observed in the solar wind upstream of the cometary bow-shock is considered in the framework of the quasilinear theory. This turbulence is driven by the heavy-ion beam created as the result of photoionization of a gas flow coming from the nuclei of the comet. The cyclotron instability of the beam gives rise to the excitation of both Alfven and magnetosonic waves and to the isotropization of the heavy ions distribution. It is shown that the wave refraction due to transverse inhomogeneity that is important near the bow-shock leads to the excitation of oblique magnetosonic waves. The equations describing the spatial variations of the wave spectra are solved.

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