Persistence of small-scale anisotropy of magnetic turbulence as observed in the solar windL. Sorriso-Valvo1, 2, V. Carbone2, R. Bruno3 and P. Veltri2
1 Liquid Crystal Laboratory, INFM/CNR - Ponte P. Bucci, Cubo 31C 87036 Rende (CS), Italy
2 Dipartimento di Fisica, Università della Calabria, and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Unità di Cosenza Ponte P. Bucci, Cubo 31C, 87036 Rende (CS), Italy
3 Istituto di Fisica dello Spazio Interplanetario-INAF - Via Fosso del Cavaliere 00133 Roma, Italy
received 14 June 2006; accepted in final form 12 July 2006
published online 28 July 2006
The anisotropy of magnetohydrodynamic turbulence is investigated by using solar wind data from the Helios 2 spacecraft. We investigate the behaviour of the complete high-order moment tensors of magnetic field increments and we compare the usual longitudinal structure functions which have both isotropic and anisotropic contributions, to the fully anisotropic contribution. Scaling exponents have been extracted by an interpolation scaling function. Unlike the usual turbulence in fluid flows, small-scale magnetic fluctuations remain anisotropic. We discuss the radial dependence of both anisotropy and intermittency and their relationship.
96.50.Ci - Solar wind plasma; sources of solar wind.
95.30.Qd - Magnetohydrodynamics and plasmas.
52.35.Ra - Plasma turbulence.
© EDP Sciences 2006