ISSN:
1572-9613
Keywords:
Velocity distribution functions
;
plasmas-nonequilibrium
;
stellar systems-nonequilibrium
;
weakly interacting many-body systems
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The most probable velocity distribution function of each component,f a , of a nonequilibrium multispecies spherically symmetric system of particles (stellar plasma atmospheres and winds, stellar systems, pellet-fusion systems) is analytically derived forthe case in which each component is described by the first six moments of f a . This is achieved by the aid of a variational approach based on the requirement that the BoltzmannH function for the system be a minimum, subject to the constraints provided by the sets of six macroscopic parameters describing the nonequilibrium state. The use of the so-obtained velocity distribution functions for the closure of the moment equations as well as for the calculation of their collisional terms (via the Fokker-Planck equation) is discussed. The limitations on the maximum deviations from the equilibrium state which are consistent with the assumptions used are also indicated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01011793
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