Suppression of Hall-term effects by gyroviscous cancellation in steady collisionless magnetic reconnection |
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Authors: | Ishizawa A Horiuchi R |
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Affiliation: | National Institute for Fusion Science, Toki, Japan. ishizawa@nifs.ac.jp |
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Abstract: | The formation of an ion-dissipation region, in which motions of electrons and ions decouple and fast magnetic reconnection occurs, is demonstrated during a steady state of two-dimensional collisionless driven reconnection by means of full-particle simulations. The Hall-term effect is suppressed due to the gyroviscous cancellation at scales between the ion-skin depth and ion-meandering-orbit scale, and thus ions are tied to the magnetic field. The ion frozen-in constraint is strongly broken by nongyrotropic pressure tensor effects due to ion-meandering motion, and thus the ion-dissipation region is formed at scales below the ion-meandering-orbit scale. A similar process is observed in the formation of an electron-dissipation region. These two dissipation regions are clearly observed in an out-of-plane current density profile. |
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