Parametrically Unstable Alfvén-cyclotron Waves and Wave-Particle Interactions in the Solar Corona and Solar Wind

Details Parametrically Unstable Alfvén-cyclotron Waves and Wave-Particle Interactions in the Solar Corona and Solar Wind Parametrically Unstable Alfvén-cyclotron Waves and Wave-Particle Interactions in the Solar Corona and Solar Wind

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1121..122m&link_type=abstract

SPACE PLASMA PHYSICS: School of Space Plasma Physics. AIP Conference Proceedings, Volume 1121, pp. 122-126 (2009).

Physics

Plasma Physics

1

Coronal Holes, Plasma Heating By Radio-Frequency Fields, Icr, Icp, Helicons, Particle Emission, Solar Wind, Solar Electromagnetic Emission

Scientific paper

We consider the parametric instabilities of large-amplitude Alfvén/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.

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