Rotation driven plasma transport - The coupling of macroscopic motion and microdiffusion

Details Rotation driven plasma transport - The coupling of macroscopic motion and microdiffusion Rotation driven plasma transport - The coupling of macroscopic motion and microdiffusion

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415041p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15041-15053.

Computer Science

Numerical Analysis

48

Astronomical Models, Corotation, Planetary Magnetospheres, Plasma Dynamics, Centrifugal Force, Io, Jupiter (Planet), Magnetic Flux, Numerical Analysis, Toroidal Plasmas

Scientific paper

The model of Pontius et al. (1986) for plasma transport in a corotation-dominated magnetosphere is modified to satisfy observational constraints introduced by Richardson and McNutt (1987). As in the earlier model, small discrete flux tubes whose plasma content differs significantly from the longitudinally averaged value (transient flux tubes) move steadily under the influence of the centrifugal force. The electric fields surrounding a transient flux tube of elliptical cross section are considered. Expressions are derived for the translational velocity and cross-sectional distortion of such flux tubes. To account for the observed radial decrease of flux shell content at Jupiter, it is assumed that plasma can pass between transient flux tubes and the background by means of single-particle microdiffusion. The background plasma distribution is affected by the passage of a transient in two ways: direct mass loading through microdiffusion and radial displacement to conserve magnetic flux. Upon adopting a simple form to describe the microdiffusion process, it is found that there exists a particular slope of flux shell plasma content for which these effects cancel and the background maintains a steady state distribution.

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