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09 February 2025
 
  » arxiv » 1109.0092

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Gyrofluid simulations of collisionless reconnection in the presence of diamagnetic effects
Emanuele Tassi ; F. Waelbroeck ; D. Grasso ;
Date 1 Sep 2011
AbstractThe effects of the ion Larmor radius on magnetic reconnection are investigated by means of numerical simulations, with a Hamiltonian gyrofluid model. In the linear regime, it is found that ion diamagnetic effects decrease the growth rate of the dominant mode. Increasing ion temperature tends to make the magnetic islands propagate in the ion diamagnetic drift direction. In the nonlinear regime, diamagnetic effects reduce the final width of the island. Unlike the electron density, the guiding center density does not tend to distribute along separatrices and at high ion temperature, the electrostatic potential exhibits the superposition of a small scale structure, related to the electron density, and a large scale structure, related to the ion guiding-center density.
Source arXiv, 1109.0092
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