Direct evidence for the presence of an inertial energy cascade, the most characteristic signature of hydromagnetic turbulence (MHD), is observed in the solar wind by the Ulysses spacecraft. A linear relation is indeed observed for the scaling of mixed ̈ third order structure functions involving Elsasser variables. This experimental result, confirming the prescription stemming from a theorem for MHD turbulence, firmly estab- lishes the turbulent character of low-frequency velocity and magnetic field fluctuations in the solar wind plasma.
The Energy Cascade in Solar Wind MHD Turbulence
CARBONE, Vincenzo;
2009-01-01
Abstract
Direct evidence for the presence of an inertial energy cascade, the most characteristic signature of hydromagnetic turbulence (MHD), is observed in the solar wind by the Ulysses spacecraft. A linear relation is indeed observed for the scaling of mixed ̈ third order structure functions involving Elsasser variables. This experimental result, confirming the prescription stemming from a theorem for MHD turbulence, firmly estab- lishes the turbulent character of low-frequency velocity and magnetic field fluctuations in the solar wind plasma.File in questo prodotto:
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