Numerical simulations of the Shoemaker‐Levy 9 impact plumes and clouds: A progress report

Preliminary 2D/3D numerical simulations were carried out for the penetration of 1‐km bodies in the Jovian atmosphere and the subsequent rise and collapse of the erupted plumes. A body that crushed at a stagnation point pressure of 5 kbar produced a plume that rose to 800 km. Evolution of the shape of the calculated plume corresponds rather well to the plumes observed by HST. A crescent‐shaped lobe centered on the “backfire” azimuth was produced by lateral flow during plume collapse. The plumes observed on Jupiter rose about 4 times higher, and their rise and fall times were about twice those in this calculation. Plume height is a sensitive function of the distribution of energy along the entry path; a very low‐strength body will disintegrate higher along the penetration path and will produce a higher plume.