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We have studied plume formation after a Jovian comet impact using the ZEUS-MP2 hydrodynamics code. The three-dimensional models followed objects with 500,750, and 1000 meter diameters. Our simulations show the development of a fast,upward-moving component of the plume in the wake of the impacting comet that"pinches off" from the bulk of the cometary material ~50 km below the 1 barpressure level, ~100 km above the depth of greatest mass and energy deposition.The fast-moving component contains about twice the mass of the initial comet,but consists almost entirely (>99.9%) of Jovian atmosphere rather than cometarymaterial. The ejecta rise mainly along the impact trajectory, but an additionalvertical velocity component due to buoyancy establishes itself within secondsof impact, leading to an asymmetry in the ejecta with respect to the entrytrajectory. The mass of the upward-moving component follows a velocitydistribution M(>v) approximately proportional to v^-1.4 (v^-1.6 for the 750 mand 500 m cases) in the velocity range 0.1 < v < 10 km/s.

Plume Development of the Shoemaker-Levy 9 Comet Impact