Self-Organization Process in Three-Dimensional Magnetohydrodynamics
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概要
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A self-organization process of a dissipative magnetohydrodynamsic plasma confined in a coducting vessel is investigated in detail by means of a variational method and a magnetohydrodynamic simulation. Several simulation runs are carried out for both compressible and incompressible media. The selforganized state for a incompressible case is given by a minimum magnetic energy condition with the constraint that the total magnetic helicity is constant, whilc, for an incompressible case, the system self-organizes to a maximum entropy state under the same constraint as the incompressible case. For each case magnetic reconnection is triggered at local minimum points of the magnetic helicity density where the selective dissipation of magnetic energy effectively takes place owing to the generation of nonhelical magnetic energy modes ("magnetic bubbles"). It is also observed that the magnetic energy spectrum cascades to ward the high wavenumber region in a relaxation phase while the helicity spectrum inversely cascades toward the low wavenumber region.
- 核融合科学研究所の論文