The magnetohydrodynamic turbulent cascade in the ecliptic solar wind: Study of Ulysses data |
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Authors: | Raffaele Marino Luca Sorriso-Valvo Pierluigi Veltri Roberto Bruno |
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Affiliation: | a Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, 87036 Rende (CS), Italy b University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, B.P. 4229, 06304 Nice Cedex 4, France c LICRYL-CNR, Ponte P. Bucci, cubo 31c, 87036 Rende, Italy d IFSI-INAF, via Fosso del Cavaliere, Roma, Italy |
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Abstract: | The occurrence of a nonlinear turbulent energy cascade in solar wind plasma has been recently established through the observation of an exact law from spacecraft measurements. The main results obtained in the fast, polar wind measured by Ulysses spacecraft are reviewed here. In particular, the turbulent cascade is seen as the mean to provide the energy necessary for the local heating in the non-adiabatic expansion of the solar wind. The importance of the density fluctuations in enhancing the turbulent energy transport is also evidenced. The ecliptic wind data measured by Ulysses are studied here in the same framework. This has been done by separating fast and slow streams, in order to avoid mixing of different physical conditions. The results further support the need for separate analysis of the two types of wind. |
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Keywords: | Solar wind Turbulence Magnetohydrodynamics |
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