Computer Science – Sound
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621037l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,037-21,053. Research supported by University of C
Computer Science
Sound
53
Computerized Simulation, Io, Magnetohydrodynamic Flow, Three Dimensional Flow, Field Aligned Currents, Hydrodynamic Equations, Spherical Coordinates
Scientific paper
A time-dependent 3D simulation of plasma flow past Jupiter's satellite Io is described. Details of the simulation model are presented and the overall features of the interaction between a magnetized flow and a finite conducting sphere (representing Io) are described. Field-aligned currents are found in regions extending downstream from the obstacle at an angle to the background field; these currents form the Alfven wings, an expected result. An 'Alfven ellipse', the interaction of a cylindrical Alfven wing with an arbitrary plane above Io, describes the obstacle that an Alfven wing presents to the flow. Perturbations carried by the other MHD modes are also present. Standing-slow mode perturbations are the most significant of these, but a fast mode signature also appears. Near Io the interaction is clearly nonlinear; all three MHD modes interact, and the local Alfven and sound speeds are altered. Estimates of the spatial location of the standing MHD mode disturbances based on the background characteristic velocities are qualitatively accurate.
Galland Kivelson Margaret
Linker Jon A.
Walker Ray J.
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