Two-scale structure of the current layer controlled by meandering motion during steady-state collisionless driven reconnection
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- A. Ishizawa
- National Institute for Fusion Science, Toki 509-5292, Japan
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- R. Horiuchi
- National Institute for Fusion Science, Toki 509-5292, Japan
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- H. Ohtani
- National Institute for Fusion Science, Toki 509-5292, Japan
抄録
<jats:p>A steady two-scale structure of current layer is demonstrated in the collisionless driven reconnections without a guide field by means of two-dimensional full-particle simulations in an open system. The current density profile along the inflow direction consists of two parts. One is a low shoulder controlled by the ion-meandering motion, which is a bouncing motion in a field reversal region. The other is a sharp peak caused mainly by the electron-meandering motion. The shoulder structure is clearly separated from the sharp peak for the case of a large mass ratio calculation mi/me=200 because the ratio of the ion-meandering orbit amplitude to the electron-meandering orbit amplitude is proportional to (mi/me)1/4. Although the ion frozen-in constraint is broken within a distance of the ion skin depth c/ωpi, the violation due to the ion inertia is weak compared to the strong violation caused by the ion-meandering motion. The violation of the electron frozen-in constraint caused by the electron-meandering motion is stronger than the violation due to the electron inertia, and thus the electron-meandering motion produces the reconnection electric field in the central region where the current has the sharp peak structure.</jats:p>
収録刊行物
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- Physics of Plasmas
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Physics of Plasmas 11 (7), 3579-3585, 2004-07-01
AIP Publishing
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キーワード
詳細情報 詳細情報について
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- CRID
- 1363951795099388160
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- NII論文ID
- 120005962056
- 30015940459
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- ISSN
- 10897674
- 1070664X
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- データソース種別
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