Geometrical MHD wave coupling

Details Geometrical MHD wave coupling Geometrical MHD wave coupling

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2030h&link_type=abstract

Journal of Geophysical Research, vol. 83, May 1, 1978, p. 2030-2036.

Physics

16

Coupled Modes, Magnetohydrodynamic Waves, Propagation Modes, Solar Wind, Boundary Value Problems, Cold Plasmas, Hydrodynamic Equations, Interplanetary Medium, Magnetic Field Configurations, Magnetoacoustic Waves, Refracted Waves, Solar Corona, Wave Equations

Scientific paper

Refraction and/or magnetic field curvature can lead to 'geometrical mode coupling' between the MHD modes. The effect is linear, but it is a finite-wavelength effect. It is studied here for a simple configuration which is amenable to analysis and which illustrates the basic features of the coupling. In the solar wind the geometrical coupling may be operative only in the solar corona or in the interaction regions of high-speed streams. In the latter case the geometrical coupling may provide an explanation for the non-Alfvenic fluctuations but only for long-period waves (greater than several hours) in small interaction regions (less than 0.1 AU).

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