Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..385...25g&link_type=abstract
Numerical Modeling of Space Plasma Flows: Astronum 2007 ASP Conference Series, Vol. 385, proceedings of the conference held 10-1
Astronomy and Astrophysics
Astronomy
Scientific paper
Waves and turbulence are ubiquitous in the solar wind. Whereas Alfvén waves and Kolmogorov-type energy spectra are found at low frequencies, whistler waves and significant steeper magnetic fluctuation power law spectra are detected at frequencies higher than a fraction of hertz at one astronomical units. This multi-scale turbulence behavior may be investigated in the framework of 3D Hall magneto-hydrodynamics. In this case, both wave turbulence analysis and high Reynolds number simulations of strong turbulent flows converge towards a steepening of magnetic spectra which may be attributed to dispersive nonlinear processes rather than pure dissipation as often stated for the solar wind. A heuristic model of anisotropic Hall MHD turbulence is proposed to describe both weak wave and strong turbulence as well as the transition between these regimes.
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