Observation of inertial energy cascade in interplanetary space plasma |
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Authors: | Sorriso-Valvo L Marino R Carbone V Noullez A Lepreti F Veltri P Bruno R Bavassano B Pietropaolo E |
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Institution: | Licryl Regional Laboratory - INFM/CNR, Ponte P. Bucci, Cubo 33C, 87036 Rende (CS), Italy. |
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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. After a brief rederivation of the equivalent of Yaglom's law for MHD turbulence, a linear relation is indeed observed for the scaling of mixed third-order structure functions involving Els?sser variables. This experimental result firmly establishes the turbulent character of low-frequency velocity and magnetic field fluctuations in the solar wind plasma. |
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