Observation of inertial energy cascade in interplanetary space plasma

Details Observation of inertial energy cascade in interplanetary space plasma Observation of inertial energy cascade in interplanetary space plasma

2007-02-09

arxiv.org/abs/astro-ph/0702264v1

Phys.Rev.Lett.99:115001,2007

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1103/PhysRevLett.99.115001

We show in this article direct evidence for the presence of an inertial energy cascade, the most characteristic signature of hydromagnetic turbulence (MHD), in the solar wind as observed by the Ulysses spacecraft. After a brief rederivation of the equivalent of Yaglom's law for MHD turbulence, we show that a linear relation is indeed observed for the scaling of mixed third order structure functions involving Els\"asser variables. This experimental result, confirming the prescription stemming from a theorem for MHD turbulence, firmly establishes the turbulent character of low-frequency velocity and magnetic field fluctuations in the solar wind plasma.

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