Anisotropies of the magnetic correlation function in the inner heliosphere

MARÍA EMILIA RUIZ; SERGIO DASSO; W. H. MATTHAEUS; E. MARSCH; J.M. WEYGAND

Saint-Malo, Francia

Conferencia; Tweflth Internacional Solar Wind Conference; 2009

American Physical Society

Magnetohydrodynamic (MHD) waves are ubiquitous in the solar wind (SW).For over four decades, low frequency plasma and electromagneticfluctuations have been observed in the SW, making it the most completelystudied case of MHD turbulence in astrophysics, and the only one extensivelyand directly studied using {it in situ} observations.Magnetohydrodynamic scale fluctuations in the interplanetary mediumare usually anisotropic, and these fluctuations frequently presentdifferent properties in regions of quasi-stationary SW or in regionsassociated with the presence of transients (e.g., magnetic clouds).In this work, we present a study of the turbulent properties in the inner heliosphere(solar wind between 0.3 and 1 AU) based on modeling {it in situ} plasmaand magnetic observations collected by Helios 1 and Helios 2 spacecraft throughout onefull eleven-year solar cycle. In particular we study the anisotropy propertiesin the inertial range. Results presented here will help us to refine models used to describethe propagation and diffusion of charged solar energetic particles in the inner heliosphereand to understand the MHD Alfvenic wave activity for this system.