Volume 75, Number 5, September 2006
|Page(s)||832 - 838|
|Section||Geophysics, astronomy, and astrophysics|
|Published online||28 July 2006|
Persistence of small-scale anisotropy of magnetic turbulence as observed in the solar wind
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
Accepted: 12 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.
PACS: 96.50.Ci – Solar wind plasma; sources of solar wind / 95.30.Qd – Magnetohydrodynamics and plasmas / 52.35.Ra – Plasma turbulence
© EDP Sciences, 2006
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