初期抵抗擾乱をうけた電流シートのMHDシミュレーション(宇宙・惑星(2),一般講演)

概要

論文の詳細を見る
Temporal evolution of a current sheet with initial perturbations is studied by using the three-dimensional resistive magnetohydrodynamic (MHD) simulations. The magnetic reconnection is considered to be the main engine of the energy release in solar flares. The structure of the diffusion region is, however, not still understood under the circumstances with enormously large magnetic Reynolds number as the solar corona. It is generally believed that the MHD turbulence should play a role in the intermediate scale. Our preliminary results are as follows: (1) In the early phase of the evolution, high wavenumber modes in the direction along the initial electric current are excited and grow. The energy spectrum in the later stage approaches a power-law function. It indicates a turbulent nature of the system. (2) Many "X"-type neutral points (lines) are generated along the magnetic neutral line (plane) in the current sheet. When they evolve into the non-linear phase, three-dimensional structures also evolve. (3) The energy release rate is reduced in case of 3D simulations compared with 2D ones.
日本流体力学会の論文
2008-09-04