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EnglishAbstract. In a magnetized plasma streaming with a non uniform velocity, the Kelvin-Helmholtz instability plays a major role in mixing different plasma regions and in stretching the magnetic field lines leading to the formation of layers with a sheared magnetic field where magnetic field line reconnection can take place. A relevant example is provided by the formation of a mixing layer between the Earth's magnetosphere and the solar wind at low latitudes during northward periods. In the considered configuration, in the presence of a magnetic field nearly perpendicular to the plane defined by the velocity field and its inhomogeneity direction, velocity shear drives a Kelvin-Helmholtz instability which advects and distorts the magnetic field configuration. If the Alfvén velocity associated to the in-plane magnetic field is sufficiently weak with respect to the variation of the fluid velocity in the plasma, the Kelvin-Helmholtz instability generates fully rolled-up vortices which advect...
| Autori interni: | |
| Autori: | PEGORARO; M. FAGANELLO; CALIFANO F |
| Titolo: | Collisionless Kelvin-Helmholtz instability and vortex-induced reconnection in the external region of the Earth magnetotail |
| Anno del prodotto: | 2008 |
| Digital Object Identifier (DOI): | 10.1088/1742-6596/133/1/012024 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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