An experimental study of electrostatic ion cyclotron waves in a two-ion component plasma

Details An experimental study of electrostatic ion cyclotron waves in a two-ion component plasma An experimental study of electrostatic ion cyclotron waves in a two-ion component plasma

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8966s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8966-8972. Research supported by the U.S. Navy and N

Physics

22

Cesium Ions, Electrostatic Waves, Ion Cyclotron Radiation, Nonuniform Plasmas, Potassium, Drift Rate, Heavy Ions, Positive Ions, Wave Excitation, Wave Propagation

Scientific paper

Two-ion-component electrostatic ion cyclotron (EIC) waves are studied in a single-ended Q-machine containing variable concentrations of Cs(+) and K(+) ions. Measurements of the excitation and propagation characteristics of the waves are presented and compared with available theories. The waves are internally excited by drawing an electron current along the magnetic field to an 11-mm exciter disk. Both Cs(+) and K(+) EIC waves can be simultaneously excited over a large range of relative ion concentrations. The EIC wave features are found to depend on the relative ion concentrations. As the K(+) (light ion) concentration is increased, the frequency of the Cs(+) (heavy ion) mode shifts toward its cyclotron frequency. Likewise, the frequency of the light ion mode approaches the light ion cyclotron frequency as the heavy ion concentration is increased. The critical drift velocity for the excitation of the heavy ion mode is more strongly dependent on the relative ion concentrations than that of the light ion mode. These results are of interest in the context of EIC wave excitation in the ionosphere.

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