Quantifying the scaling properties and the crossover between the inertial and dissipation ranges in solar wind turbulence with CLUSTER magnetic field observations.

The CLUSTER high resolution magnetometer observations in the solar wind cover timescales that potentially span the inertial and dissipation ranges of local intermittent turbulence. One may anticipate a crossover in behaviour from intermittent MHD turbulence to that dominated by ion kinetic effects. Theoretical predictions for the dissipation range typically center around the power spectrum, and these include either a modified turbulent cascade with an associated range of power law scaling, or a phenomenology dominated by damping implying an exponential rolloff. Motivated by the need to distinguish these predictions, we perform statistical analyses (PDF rescaling and generalized structure functions) to quantify the scaling of fluctuations as we pass though the crossover from inertial range to dissipation range phenomenology. In particular we explore whether deviations from power law scaling are of a form that can be removed by Extended Self Similarity, so that scaling is manifested in ratios of the structure functions.