On the role of ion temperature anisotropy in the growth and propagation of shear-modified ion-acoustic waves

Details On the role of ion temperature anisotropy in the growth and propagation of shear-modified ion-acoustic waves On the role of ion temperature anisotropy in the growth and propagation of shear-modified ion-acoustic waves

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1043t&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A1, pp. SMP 25-1, CiteID 1043, DOI 10.1029/2002JA009395

Physics

Plasma Physics

4

Ionosphere: Plasma Waves And Instabilities, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Laboratory Studies, Space Plasma Physics: Waves And Instabilities

Scientific paper

Oblique ion-acoustic waves, excited by the combination of magnetic field-aligned (parallel) electron drift and sheared parallel ion flow, are investigated in magnetized laboratory plasma that is characterized by ion temperature anisotropy. Direct measurements of the parallel and perpendicular ion temperatures, parallel and perpendicular ion drift velocities, electron temperature and parallel electron drift velocity, parallel and perpendicular wave vector components, and mode frequency and growth rate are used to elucidate the shear-modified ion-acoustic (SMIA) instability mechanism and document an observed correlation between ion temperature anisotropy and wave propagation angle. Experimental measurements show that anisotropy significantly influences the growth rate and propagation angle of oblique ion-acoustic waves. These results support the ion-acoustic wave interpretation of broadband waves in the auroral energization region where shear and anisotropy are known to exist and may have ramifications for many space plasmas in which anisotropy exists in the electron temperature or ion temperature.

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