Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10227249w&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue A12, p. 27249-27256
Physics
19
Ionosphere: Electric Fields, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Convection, Ionosphere: Plasma Waves And Instabilities
Scientific paper
Simultaneous density and electric field fluctuation spectra, associated with velocity shear (both in the transverse to the magnetic field ion flow velocity and in the parallel ion flow velocity), have been observed by the DE 2 spacecraft in the F region [Basu et al., 1984]. Basu and Coppi [1988, 1989] argued that the subkilometer scale irregularities are due to collisional electrostatic modes excited in a partially ionized plasma in the presence of shear in the parallel ion flow. In this paper we describe results of a laboratory investigation of the effects of neutral-particle collisions on the parallel velocity shear instability, performed using a double-ended Q machine. The critical value of the shear dv0/dx, the derivative of the field-aligned ion flow with respect to the transverse (to B) coordinate, is determined and compared with theoretical predictions.
D'Angelo Nicola
Merlino Robert L.
Willig Joyce
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