Particle acceleration by MHD surface wave and formation of aurora

Details Particle acceleration by MHD surface wave and formation of aurora Particle acceleration by MHD surface wave and formation of aurora

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5083h&link_type=abstract

Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 5083-5090.

Physics

147

Auroral Arcs, Magnetohydrodynamic Waves, Particle Acceleration, Surface Waves, Geomagnetism, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Plasma Acceleration, Wave Excitation

Scientific paper

Hydromagnetic surface waves, excited either by a MHD plasma instability or an externally applied impulse, are shown to convert in a resonant mode to a kinetic Alfven wave having a wavelength comparable to the ion gyroradius in the direction perpendicular to the magnetic field. The kinetic Alfven wave has a component of its electric field in the direction of the ambient magnetic field and can accelerate plasma particles along the field line. Because of the property of the wave, the acceleration occurs on a thin magnetic surface separated by the ion gyroradius. A possible relation between this type of acceleration and the formation of auroral arcs is discussed.

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