Transverse dynamics of dispersive Alfvén waves. I. Direct numerical evidence of filamentation
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- D. Laveder
- CNRS UMR 6529, Observatoire de la Côte d’Azur, BP 4229, 06304 Nice Cedex 4, France
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- T. Passot
- CNRS UMR 6529, Observatoire de la Côte d’Azur, BP 4229, 06304 Nice Cedex 4, France
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- P. L. Sulem
- CNRS UMR 6529, Observatoire de la Côte d’Azur, BP 4229, 06304 Nice Cedex 4, France
説明
<jats:p>The three-dimensional dynamics of a small-amplitude monochromatic Alfvén wave propagating along an ambient magnetic field is simulated by direct numerical integration of the Hall-magnetohydrodynamics equations. As predicted by the two-dimensional nonlinear Schrödinger equation or by more general amplitude equations retaining the coupling to low-frequency magnetosonic waves, the transverse instability of the pump leads to wave collapse and formation of intense magnetic filaments, in spite of the presence of competing, possibly linearly dominant, instabilities that in some instances distort the above structures. In computational boxes, including a large number of pump wavelengths, an early arrest of the collapse is possible under the effect of quasi-transverse instabilities that drive magnetosonic waves and also prescribe the directions of the filaments.</jats:p>
収録刊行物
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- Physics of Plasmas
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Physics of Plasmas 9 (1), 293-304, 2002-01-01
AIP Publishing