Temperature gradients and velocity shears - Free energy sources for turbulence in the boundary layer

Details Temperature gradients and velocity shears - Free energy sources for turbulence in the boundary layer Temperature gradients and velocity shears - Free energy sources for turbulence in the boundary layer

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..867m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Feb. 1, 1988, p. 867-876.

Physics

10

Energy Sources, Magnetospheric Ion Density, Plasma Layers, Temperature Gradients, Turbulent Boundary Layer, Ion Temperature, Velocity Distribution

Scientific paper

The roles played by temperature gradients and velocity shears in causing turbulence in the plasma sheet boundary layer are examined. Both are sources of free energy that can be tapped by perturbations, which can then grow and result in turbulence, thus generating anomalous particle and energy transport. It is found that ion temperature gradients and ion velocity shear play parallel roles in destabilizing a unique low-frequency mode, the ion acoustic wave which may be termed a Kelvin-Helmholtz or temperature gradient instability, depending on which free energy source is dominant. There never is more than one unstable electrostatic mode present, driven by these two sources. A general expression for the critical velocity shear is presented, and the critical value(s) of the temperature gradient is (are) discussed. The finite-beta modifications to these instabilities of the ion acoustic wave and their quasi-linear feedback on the plasma are discussed.

Affiliated with

Also associated with

No associations

Rating

Temperature gradients and velocity shears - Free energy sources for turbulence in the boundary layer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Temperature gradients and velocity shears - Free energy sources for turbulence in the boundary layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature gradients and velocity shears - Free energy sources for turbulence in the boundary layer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1226751