リコネクションジェット先端領域における不安定の流体的研究

*丹所 良二[1], 藤本 正樹[1]

東京工業大学大学院理工学研究科地球惑星科学専攻[1]

Hydrodynamical study of instability at leading part of reconnection jet

*Ryoji Tandokoro[1] ,Masaki Fujimoto [1]
Tokyo Institute of Technology[1]

We have conducted three-dimensional MHD andHall-MHD simulations and have clarified the nature ofinstability at leading part of reconnection jet. From MHD simulation results, the driving mechanismof the instability seems to be essentially the same as the Richtmyer-Meshkov instability. By comparing a number of single-mode runs, we find the shorter wavelength mode to grow faster. While the driving mechanism seems to stay the same, Hall-MHD simulation results show development to turbulence-like state is observed even when starting frin a single-mode initial disturbance. We have also found the fastest growing wavelength to show quite peculiar featuer in Hall-MHD: Shorter wavelength is preferred as the thickness of the current sheet is increased.