Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1216..227m&link_type=abstract
TWELFTH INTERNATIONAL SOLAR WIND CONFERENCE. AIP Conference Proceedings, Volume 1216, pp. 227-230 (2010).
Physics
1
Solar Wind, Plasma Magnetohydrodynamics, Landau Levels, Plasma Turbulence, Particle Emission, Solar Wind, Ideal And Resistive Mhd Modes, Kinetic Modes, Landau Levels, Turbulence
Scientific paper
We perform 1 D hybrid simulations to investigate the nonlinear kinetic behavior of the tenuous collisionless magnetized plasma in coronal holes and fast solar wind. Initially isotropic ion distributions are reshaped via wave-particle interactions with resonant daughter waves that are born by parametrically unstable large-amplitude Alfvén-cyclotron waves. Decay processes lead to the formation of both acoustic and electromagnetic micro-turbulence, which further influence the motion of the ions via Landau damping and pitch-angle scattering. This leads to a depletion of the pump and destroys the fluid coherence of the medium. Parametric instabilities act to randomize the ion distributions, causing anisotropic heating and resulting in differential streaming and formation of ion beams. Due to their low mass densities and charge-to-mass ratios heavy ions are preferentially heated and obtain higher anisotropies than protons.
Araneda Jaime A.
Maneva Yana G.
Marsch Eckart
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