Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-05
Astronomy and Astrophysics
Astrophysics
19 pages, in press on Physics of Plasmas
Scientific paper
10.1063/1.2711429
Interplanetary magnetic field magnitude fluctuations are notoriously more intermittent than velocity fluctuations in both fast and slow wind. This behaviour has been interpreted in terms of the anomalous scaling observed in passive scalars in fully developed hydrodynamic turbulence. In this paper, the strong intermittent nature of the interplanetary magnetic field is briefly discussed comparing results performed during different phases of the solar cycle. The scaling properties of the interplanetary magnetic field magnitude show solar cycle variation that can be distinguished in the scaling exponents revealed by structure functions. The scaling exponents observed around solar maximum coincide, within the errors, to those measured for passive scalars in hydrodynamic turbulence. However, it is also found that the values are not universal in the sense that the solar cycle variation may be reflected in dependence on the structure of the velocity field.
Bruno Roberto
Carbone Vincenzo
Chapman Sandra
Hnat Bogdan
Noullez Alain
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