Whistler Turbulence Cascade: Three-Dimensional Particle-In Simulations

Details Whistler Turbulence Cascade: Three-Dimensional Particle-In Simulations Whistler Turbulence Cascade: Three-Dimensional Particle-In Simulations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43c1960c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43C-1960

Physics

Plasma Physics

[2159] Interplanetary Physics / Plasma Waves And Turbulence, [2164] Interplanetary Physics / Solar Wind Plasma, [7863] Space Plasma Physics / Turbulence, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

The first fully three-dimensional particle-in-cell (PIC) simulation of whistler turbulence in a magnetized, homogeneous, collisionless plasma has been carried out. An initial relatively isotropic spectrum of long-wavelength whistlers is imposed upon the system, with an initial electron β = 0.10. As in previous two-dimensional simulations of whistler turbulence, the three-dimensional system exhibits a forward cascade to shorter wavelengths and broadband, turbulent spectra with an anisotropy in the sense of stronger fluctuation energy at k⊥ than at comparable k|| where the respective subscripts represent directions perpendicular and parallel to the background magnetic field Bo. However, the three-dimensional simulations show the turbulence develops a faster and stronger anisotropic cascade than in comparable two-dimensional computations. Furthermore, the more modes that are used as initial conditions, the more rapid the cascade and the more strongly anisotropic the turbulence becomes.

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