Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh53a1299c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH53A-1299
Physics
Plasma Physics
[7839] Space Plasma Physics / Nonlinear Phenomena, [7863] Space Plasma Physics / Turbulence
Scientific paper
Incompressible and isotropic magnetohydrodynamic turbulence in plasmas can be described by an exact relation for the energy flux through the scales. This Yaglom-like scaling law has been recently observed in the solar wind above the solar poles observed by the Ulysses spacecraft, where the turbulence is in an Alfvenic state. An analogous phenomenological scaling law, suitably modified to take into account compressible fluctuations, is observed more frequently in the same data set. Large-scale density fluctuations, despite their low amplitude, thus play a crucial role in the basic scaling properties of turbulence. The turbulent cascade rate in the compressive case can, moreover, supply the energy dissipation needed to account for the local heating of the nonadiabatic solar wind.
Bruno Roberto
Carbone Vincenzo
Marino Raffaele
Noullez Alain
Sorriso-Valvo Luca
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