@techreport{oai:nifs-repository.repo.nii.ac.jp:00009936,
 author = {"Matsunaga,  E. and Yabe,  T. and Tajima,  M."},
 month = {Sep},
 note = {"Impact of Shoemaker-Levy 9 caused various changes on Jupiter. One of them is the comet impact sites left on the surface of Jupiter. These impact sites were very stable and long-1ived, which is a mystery worthy for detailed investigation. One hypothesis that is most probable one is to attribute these stable structures to vortex. Then a question arises when the vortex is generated. This paper shows that quite a large vortex can be generated by baroclinic mechanism which is caused by non-parallel density and pressure gradients during the break-up of the comet in Jovian atmosphere.  The size of the vorticity thus generated is consistent with the size of comet impact sites under Kelvin's circulation theorem."},
 title = {Baroclinic Vortex Generation by a Comet Shoemaker-Levy 9 Impact},
 year = {1997}
}