Plasma expansion and evolution of density perturbations in the polar wind - Comparison of semikinetic and transport models

Details Plasma expansion and evolution of density perturbations in the polar wind - Comparison of semikinetic and transport models Plasma expansion and evolution of density perturbations in the polar wind - Comparison of semikinetic and transport models

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813581h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,581-13,593.

Other

9

Ion Motion, Ionospheric Ion Density, Magnetohydrodynamic Flow, Plasma Density, Velocity Distribution, Heat Flux, Ionospheric Drift, Mathematical Models, Polar Regions

Scientific paper

Comparisons are made between transport and semikinetic models in a study of the time evolution of plasma density perturbations in the polar wind. The situations modeled include plasma expansion into a low-density region and time evolution of localized density enhancements and cavities. The results show that the semikinetic model generally yields smoother profiles in density, drift velocity, and ion temperature than the transport model, principally because of ion velocity dispersion. While shocks frequently develop in the results of the transport model, they do not occur in the semikinetic results. In addition, in the semikinetic results, two ion streams, or double-humped distributions, frequently develop. In the transport model results the bulk parameters, at a given time, often have a one-to-one correspondence in the locations of their local minima or maxima. This is a consequence of the coupling of the fluid equations. There is, however, no such relationship among the moments produced by the semikinetic model where the local moment maxima and minima are often shifted in altitude. In general, incorporation of enhanced heat fluxes in the transport model leads to somewhat improved agreement with the semikinetic results.

Affiliated with

Also associated with

No associations

Rating

Plasma expansion and evolution of density perturbations in the polar wind - Comparison of semikinetic and transport models 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 Plasma expansion and evolution of density perturbations in the polar wind - Comparison of semikinetic and transport models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plasma expansion and evolution of density perturbations in the polar wind - Comparison of semikinetic and transport models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1493057