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The possible magnetic torus in stellar interior

S-I Itoh, K Itoh, H Shibahashi, P H Diamond, A Yoshizawa2007年Plasma Physics and Controlled FusionIF 2.2出版社

Various possibilities of the structure of the magnetic field, which is driven by turbulent dynamo mechanisms, in the stellar convection zone are analysed, putting an emphasis on the cross-helicity dynamo effect. A relation between the cross-helicity dynamo and rotation is discussed. An evaluation is made for the cross-helicity-driven magnetic field, and the influence of the rotation is illustrated. A case in which the convection zone is lying just below the surface (like the solar convection zone) is analysed. The toroidal magnetic field structure is predicted to exist in stellar interior, and the analogy to laboratory toroidal plasmas is explained. The interior magnetic field is divided into two classes. One is dominated by the poloidal–radial component: activity may be seen near the polar region for this case. In the other, the magnetic field is dominated by the toroidal magnetic field as tokamaks in laboratory experiments.

日本語訳

恒星対流層における乱流ダイナモ機構によって駆動される磁場構造の多様な可能性について、クロスヘリシティ・ダイナモ効果に重点を置いて分析する。クロスヘリシティ・ダイナモと回転の関係について考察する。クロスヘリシティ駆動磁場の評価を行い、回転の影響を明示する。対流層が表面直下に位置する場合(太陽対流層のような場合)を分析する。トロイダル磁場構造が恒星内部に存在すると予測され、実験室プラズマにおけるトカマクとの類似性が説明される。内部磁場は二つのクラスに分類される。一つはポロイダル・ラジアル成分が支配的であり、この場合、活動は極域付近で観測される可能性がある。もう一つは、実験室実験におけるトカマクと同様に、トロイダル磁場が支配的である。

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