Perpendicular ion beam-driven instability in a multicomponent plasma - Effects of varying ion composition on linear flute mode oscillations

Details Perpendicular ion beam-driven instability in a multicomponent plasma - Effects of varying ion composition on linear flute mode oscillations Perpendicular ion beam-driven instability in a multicomponent plasma - Effects of varying ion composition on linear flute mode oscillations

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3305w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3305-3310.

Computer Science

Sound

5

Beam Injection, Ion Beams, Magnetohydrodynamic Stability, Plasma-Particle Interactions, Space Plasmas, Argon Plasma, Electron Density (Concentration), Power Spectra, Sounding Rockets

Scientific paper

Predictions of a theoretical model are compared with the power spectrum measured by a Langmuir probe mounted on a sounding rocket which injected neutral ions into the ambient plasma during the downward trajectory. The experimental results from the Argon Controlled Release Study (ARCS) were examined with a collisionless flute mode dispersion relation for a multicomponent plasma. A two-ion component background plasma is assumed, along with ion masses which differ by no more than a factor of two. Solutions to the linear model are obtained in terms of the absence of ion Bernstein modes and the presence of an Ar(+) ion beam. The results for the first three modes indicate that the mode growth rate increases with increasing wavenumber. The predictions are well-matched by the rocket data, although it is understood that the ion masses varied by significant values in the region explored. However, absolute mode identification from probe power spectra is not expected to become a reality without further laboratory cross-correlations and interferometric measurements.

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