dorsal/arxiv
View SchemaFluid Models for Kinetic Effects on Coherent Nonlinear Alfven Waves. II. Numerical Solutions
| Authors | M. V. Medvedev, V. I. Shevchenko, P. H. Diamond, V. L. Galinsky |
|---|---|
| Categories | |
| ArXiv ID | physics/9612018 |
| URL | https://arxiv.org/abs/physics/9612018 |
| DOI | 10.1063/1.872356 |
| Journal | Phys. Plasmas, v.4, pp.1257-1285 (1997) |
Abstract
The influence of various kinetic effects (e.g. Landau damping, diffusive and collisional dissipation, and finite Larmor radius terms) on the nonlinear evolution of finite amplitude Alfvenic wave trains in a finite-beta environment is systematically investigated using a novel, kinetic nonlinear Schrodinger (KNLS) equation. The dynamics of Alfven waves is sensitive to the sense of polarization as well as the angle of propagation with respect to the ambient magnetic field. Numerical solution for the case with Landau damping reveals the formation of dissipative structures, which are quasi-stationary, S-polarized directional (and rotational) discontinuities which self-organize from parallel propagating, linearly polarized waves. Parallel propagating circularly polarized packets evolve to a few circularly polarized Alfven harmonics on large scales. Stationary arc-polarized rotational discontinuities form from obliquely propagating waves. Collisional dissipation, even if weak, introduces enhanced wave damping when beta is very close to unity. Cyclotron motion effects on resonant particle interactions introduce cyclotron resonance into the nonlinear Alfven wave dynamics.
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"abstract": "The influence of various kinetic effects (e.g. Landau damping, diffusive and\ncollisional dissipation, and finite Larmor radius terms) on the nonlinear\nevolution of finite amplitude Alfvenic wave trains in a finite-beta environment\nis systematically investigated using a novel, kinetic nonlinear Schrodinger\n(KNLS) equation. The dynamics of Alfven waves is sensitive to the sense of\npolarization as well as the angle of propagation with respect to the ambient\nmagnetic field. Numerical solution for the case with Landau damping reveals the\nformation of dissipative structures, which are quasi-stationary, S-polarized\ndirectional (and rotational) discontinuities which self-organize from parallel\npropagating, linearly polarized waves. Parallel propagating circularly\npolarized packets evolve to a few circularly polarized Alfven harmonics on\nlarge scales. Stationary arc-polarized rotational discontinuities form from\nobliquely propagating waves. Collisional dissipation, even if weak, introduces\nenhanced wave damping when beta is very close to unity. Cyclotron motion\neffects on resonant particle interactions introduce cyclotron resonance into\nthe nonlinear Alfven wave dynamics.",
"arxiv_id": "physics/9612018",
"authors": [
"M. V. Medvedev",
"V. I. Shevchenko",
"P. H. Diamond",
"V. L. Galinsky"
],
"categories": [
"physics.plasm-ph",
"adap-org",
"astro-ph",
"nlin.AO",
"nlin.PS",
"patt-sol",
"physics.space-ph"
],
"doi": "10.1063/1.872356",
"journal_ref": "Phys. Plasmas, v.4, pp.1257-1285 (1997)",
"title": "Fluid Models for Kinetic Effects on Coherent Nonlinear Alfven Waves. II. Numerical Solutions",
"url": "https://arxiv.org/abs/physics/9612018"
},
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