“dŽqƒXƒP[ƒ‹Œ»Û‚Ɉ͂܂ꂽMHDƒXƒP[ƒ‹‚̉Q‚Ì•ö‰ó
*—Ñ ‘å•ã[1], “¡–{ ³Ž÷[1], ŽÂŒ´ ˆç[2]
“Œ‹žH‹Æ‘åŠw@’n‹…˜f¯‰ÈŠw‰È[1]
‰F’ˆ‰ÈŠwŒ¤‹†Š[2]
Decay of MHD-scale vortices mediated by parasitic electron dynamics
*Daisuke Hayashi[1]
,Masaki Fujimoto [1],Iku Shinohara [2]
Department of Earth and Planetary Sciences, Tokyo Institute of Technology[1]
Institute of Space and Astronautical Science[2]
The two fluid model that takes the finite electron inertia effects
into account by modifying the induction equation from Hall-MHD
equations is useful in studying large scale MHD scale dynamics
while resolving the electron scales. In this study, we have performed
two-dimensional simulations of the Kelvin-Helmholtz instability
at the magnetopause-like situation. The instability grows and
the highly rolled-up vortex appears in the non-linear stage as
in MHD calculations. What is striking, however, is that, in the
presence of electron inertia effects, smaller vortices grow within
the MHD scale vortex and eventually the MHD vortex decays. The
implication of the results to the plasma transport across the
tail-flank is discussed.