The excitation of plasma waves by a current source moving in a magnetized plasma - The MHD approximation

Details The excitation of plasma waves by a current source moving in a magnetized plasma - The MHD approximation The excitation of plasma waves by a current source moving in a magnetized plasma - The MHD approximation

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..505r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 505-515.

Physics

25

Magnetohydrodynamics, Plasma Waves, Space Plasmas, Tetherlines, Wave Excitation, Cold Plasmas, Fourier Transformation, Ion Cyclotron Radiation, S Waves, Wave Equations

Scientific paper

Alfven waves are important in natural-space phenomena, and studies of these waves have been conducted by performing active experiments in space plasma. One method to study these waves involves the use of an electrodynamic tether. The electrodynamic tether consists of a subsatellite with a conducting outer surface connected to the Space Shuttle by an insulator-clad, conducting wire about 20 kilometers in length. The emf generated by the motion of the tether across the geomagnetic field will act to drive a current through the tethered system. It is pointed out that this current in the tether acts as a source for exciting the shear-Alfven wave. In the present investigation it is shown that fringing effects play a dominant role in determining the radiation pattern for currently envisioned deployments of the tether. The current paper is the first of three papers concerned with the excitation of low-frequency waves arising from a current source moving through a cold, magnetized plasma.

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