On Stochastic Heating of Charged Particles by Low-Frequency Alfvén Waves*

Details On Stochastic Heating of Charged Particles by Low-Frequency Alfvén Waves* On Stochastic Heating of Charged Particles by Low-Frequency Alfvén Waves*

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh21a0727c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH21A-0727

Physics

2118 Energetic Particles, Solar, 2149 Mhd Waves And Turbulence, 7509 Corona, 7807 Charged Particle Motion And Acceleration

Scientific paper

Using Poincare plots, we have systematically investigated the charged particle dynamics in the presence of obliquely propagating single coherent Alfvén waves. Contrary to conventional understanding, our results indicate that, with sufficiently large wave amplitude, significant stochastic heating can be obtained with wave frequencies even at small fractions of the corresponding cyclotron frequency. Physically, the heating mechanism is associated with nonlinear resonances between the cyclotron motion and the wave-induced guiding-center motion. More specifically, the corresponding nonlinearity parameter is |kperpendicular to ṡ Xgw| with kperpendicular to being the wavevector perpendicular to the confining magnetic field and Xgw is the wave-induced curvature-drift displacement of the guiding centers. Finite |kperpendicular to ṡ Xgw|, thus, produced higher harmonics in the wave frequency ω and, as a consequence, produces resonances at mω = ω c where m >> 1 and ω c is the cyclotron frequency. Since this heating mechanism heats preferentially in the perpendicular direction as well as charged particles with higher (q/m) values, it may be of relevance to ion heatings in solar corona and solar wind plasmas. Results of test particles simulations with spectra of Alfvén-wave turbulences will also be presented.špace*{.15in}\Research supported by US DOE and NSF Grants.

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