Physics – Plasma Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1469m&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SMP 28-1, CiteID 1469, DOI 10.1029/2002JA009277
Physics
Plasma Physics
2
Space Plasma Physics: Laboratory Studies, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Auroral Phenomena (2407), Space Plasma Physics: Waves And Instabilities
Scientific paper
We present a laboratory investigation of Alfvén wave refraction due to a gradient in the plasma beta along the magnetic field. Theoretically, it is expected that perpendicular wave refraction occurs when the Alfvén wave changes from kinetic to inertial, as occurs along a typical auroral field line. The change in propagation characteristics is expected to produce a focusing of the wave energy. In the Earth's magnetosphere it is thought that this refractive property may play a key role in the field line resonance process. This effect is observed in the laboratory by creating a plasma with a parallel \bar{\beta} gradient of 100 per 105 Debye lengths. An Alfvén wave is then launched with an antenna, and the B field patterns of the wave are observed at several axial locations.
Gekelman W. N.
Maggs James E.
Mitchell Charles
Vincena S. T.
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