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We apply two distinct nonlinear techniques, kurtosis and phase coherence\udindex, to analyze the modulus of interplanetary magnetic field data |<I>B</I>|\udmeasured by Cluster and ACE spacecraft from 1 to 3 February 2002. High\uddegree of phase synchronization is found across a wide range of time scales,\udfrom 1 s to 10<sup>4</sup> s, in the magnetic field fluctuations, both in the\udshocked solar wind upstream of Earth's bow shock and in the unshocked ambient\udsolar wind at the L1 Lagrangian point. This is the first direct measurement\udof phase coherence in the ambient solar wind turbulence. We show that phase\udsynchronization related to nonlinear multiscale interactions is the origin of\udthe departure from Gaussianity in the intermittent magnetic field turbulence.\udIn particular, we demonstrate that at small scales near the spectral break\udthe intermittency level of Cluster is lower than ACE, which may be a\udsignature of the reflected ions from the shock

annales geophysicae

Cluster and ACE observations of phase synchronization in intermittent magnetic field turbulence: a comparative study of shocked and unshocked solar wind