The excitation of plasma waves by a current source moving in a magnetized plasma - Two-dimensional propagation

Details The excitation of plasma waves by a current source moving in a magnetized plasma - Two-dimensional propagation The excitation of plasma waves by a current source moving in a magnetized plasma - Two-dimensional propagation

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510459r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10459-10469.

Physics

7

Equations Of Motion, Magnetization, Plasma Waves, Space Plasmas, Two Dimensional Flow, Wave Excitation, Cyclotron Frequency, Fourier Transformation, Mathematical Models, Spatial Distribution

Scientific paper

The steady motion of a large conducting body in a magnetized plasma has been shown to create a spatial structure of charges and currents in the plasma which propagate without attenuation along the magnetic field direction (the label 'Alfven wings' has been given to this structure because of its resemblance to the wings of a biplane). It has been found that the Alfven wing structure breaks up into individual Fourier components which propagate away from the source at an angle slightly greater with respect to the magnetic field than the alignment of the original structure. This process depends on wave frequency. A given frequency is lost from the Alfven wing structure at a distance which varies as 1/omega-cubed. The amplitude of these traveling waves decreases at a rate which is inversely proportional to the square root of the distance from the source.

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