Direct evidence for the presence of an inertial energy cascade, the most characteristic signature ofhydromagnetic turbulence (MHD), is observed in the solar wind by the Ulysses spacecraft. After a briefrederivation of the equivalent of Yaglom’s law for MHD turbulence, a linear relation is indeed observedfor the scaling of mixed third-order structure functions involving Elsasser variables. This experimentalresult firmly establishes the turbulent character of low-frequency velocity and magnetic field fluctuationsin the solar wind plasma.

Observation of inertial energy cascade in interplanetary space plasma

CARBONE, Vincenzo;LEPRETI, Fabio;VELTRI, Pierluigi;
2007-01-01

Abstract

Direct evidence for the presence of an inertial energy cascade, the most characteristic signature ofhydromagnetic turbulence (MHD), is observed in the solar wind by the Ulysses spacecraft. After a briefrederivation of the equivalent of Yaglom’s law for MHD turbulence, a linear relation is indeed observedfor the scaling of mixed third-order structure functions involving Elsasser variables. This experimentalresult firmly establishes the turbulent character of low-frequency velocity and magnetic field fluctuationsin the solar wind plasma.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/143952
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