  Although the interplanetary magnetic field variability has been extensively
investigated in situ by means of data coming from several space missions, the
newly launched missions providing high-resolution measures and approaching the
Sun, offer the possibility to study the multiscale variability in the innermost
solar system. Here by means of the Parker Solar Probe measurements we
investigate the scaling properties of solar wind magnetic field fluctuations at
different heliocentric distances. The results show a clear transition at
distances close to say 0.4 au. Closer to the Sun fluctuations show a f^-3/2
frequency power spectra and regular scaling properties, while for distances
larger than 0.4 au fluctuations show a Kolmogorov spectrum f^-5/3 and are
characterized by anomalous scalings. The observed statistical properties of
turbulence suggests that the solar wind magnetic fluctuations, in the late
stage far form the Sun, show a multifractal behaviour typical of turbulence and
described through intermittency, while in the early stage, when leaving the
solar corona, a breakdown of these properties are observed, thus showing a
statistical monofractal global self-similarity. Physically the breakdown
observed close to the Sun should be due either to a turbulence with regular
statistics or to the presence of intense stochastic fluctuations able to cancel
out correlations necessary for the presence of anomalous scaling.
