Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..303m&link_type=abstract
SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-
Astronomy and Astrophysics
Astrophysics
Electron Magnetohydrodynamics, Solar Wind, Turbulence
Scientific paper
Solar wind turbulence is characterized by a Kolmogorovian magnetic fluctuations spectrum at large scales followed by a second inertial range with steeper spectra associated with nonlinear dispersive processes. Recent observations reveal the presence of a third region -- called dissipation range -- at scales smaller than the electron inertial length and characterized by steeper spectra. We investigate this regime in the electron magnetohydrodynamics approximation and discuss the possibility to derive an exact and universal law for third-order structure functions. This law corresponds to a magnetic fluctuations isotropic spectrum in k-11/3 compatible with the observations. We conclude on the possible existence of a third turbulence regime in the solar wind instead of a dissipation range as recently postulated.
Galtier Sebastien
Meyrand R.
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