Enhanced spectral anisotropies near the proton-cyclotron scale: Possible two-component structure in Hall-FLR MHD turbulence simulations

Details Enhanced spectral anisotropies near the proton-cyclotron scale: Possible two-component structure in Hall-FLR MHD turbulence simulations Enhanced spectral anisotropies near the proton-cyclotron scale: Possible two-component structure in Hall-FLR MHD turbulence simulations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh41c..07g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH41C-07

Physics

Plasma Physics

[7839] Space Plasma Physics / Nonlinear Phenomena, [7863] Space Plasma Physics / Turbulence, [7868] Space Plasma Physics / Wave/Wave Interactions

Scientific paper

Recent analysis of the magnetic correlation function of solar wind fluctuations at 1 AU suggests the existence of two-component structure near the proton-cyclotron scale. Here we use two-and-one-half dimensional and three-dimensional compressible MHD models to look for two-component structure adjacent the proton-cyclotron scale. Our MHD system incorporates both Hall and Finite Larmor Radius (FLR) terms. We find that strong spectral anisotropies appear adjacent the proton-cyclotron scales depending on selections of initial condition and plasma beta. These anisotropies are enhancements on top of related anisotropies that appear in standard MHD turbulence in the presence of a mean magnetic field and are suggestive of one turbulence component along the inertial scales and another component adjacent the dissipative scales. We compute the relative strengths of linear and nonlinear accelerations on the velocity and magnetic fields to gauge the relative influence of terms that drive the system with wave-like (linear) versus turbulent (nonlinear) dynamics.

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