Model - Model Comparisons of Inner Magnetosphere Plasma Convection

Details Model - Model Comparisons of Inner Magnetosphere Plasma Convection Model - Model Comparisons of Inner Magnetosphere Plasma Convection

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm13b..07p&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM13B-07

Physics

2409 Current Systems (2721), 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling

Scientific paper

The Rice Convection Model (RCM) treats the physics of plasma convection in the inner magnetosphere by following the bounce-averaged behavior of single particles whose properties, on average, are described by an isotropic distribution function. The traditional RCM formulation makes no explicit assumption of local thermodynamic equilibrium, since the different energy components of an initial thermal distribution are allowed to evolve independently. An alternate two-fluid description of inner magnetosphere convection has been put forward by C. Peymirat and colleagues. In this formulation the entropy of a fluid mass element is constant along a drift path, such that if a given mass of fluid is initially in thermodynamic equilibrium, it will remain so as it drifts. Theoretical arguments suggest that the two formalisms should yield equivalent results if: (1) the RCM is modified to explicitly maintain local thermodynamic equilibrium as plasma is convected; and (2) an explicit heat flux term is added to the Peymirat model. We examine how these different formulations and assumptions affect the computed evolution of the inner magnetosphere by conducting model - model comparisons, both with and without the modifications described above, for identical initial and boundary conditions.

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