Parametrically Unstable Alfven-cyclotron Waves and Wave--Particle Interactions in the Solar Corona and Solar Wind
- Max-Planck-Institut fuer Sonnensystemforschung, D-37191 Katlenburg-Lindau (Germany)
- Departamento de Fisica, Facultad de Ciencias Fisicas y Matematicas, Universidad de Conception, Conception (Chile)
We consider the parametric instabilities of large-amplitude Alfven/ion-cyclotron waves and the consequent wave-particle interactions, and discuss their importance for modelling the evolution of ion velocity distribution functions in the tenuous and collisionless plasma of a coronal hole and the fast solar wind. We perform 1D hybrid simulations to study the nonlinear evolution of the parametric instabilities by analyzing the simulation results in terms of microinstabilities and discussing the influence of both Landau and cyclotron resonances on the evolution of the ion distributions. We demonstrate the origin of a relative drift between the protons and alpha particles, show the related anisotropic ion heating and follow the simultaneous proton beam formation. Finally, we focus on the development and evolution of both electromagnetic and acoustic micro-turbulence and present indications for an inverse energy cascade from shorter to longer wavelengths.
- OSTI ID:
- 21308640
- Journal Information:
- AIP Conference Proceedings, Vol. 1121, Issue 1; Conference: School of space plasma physics, Sozopol (Bulgaria), 31 Aug - 7 Sep 2008; Other Information: DOI: 10.1063/1.3137931; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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