The solar wind provides a natural laboratory for observations of magnetohydrodynamic
(MHD) turbulence over extended temporal scales. Here, we apply a model independent
method of differencing and rescaling to identify self-similarity in the probability density
functions (PDF) of fluctuations in solar wind bulk plasma parameters as seen by the WIND
spacecraft. Whereas the fluctuations of speed v and interplanetary magnetic field (IMF)
magnitude B are multifractal, we find that the fluctuations in the ion density ρ, energy …

We apply a model independent method of differencing and rescaling to identify self-similarity
in the Probability Density Functions (PDF) of fluctuations in solar wind bulk plasma
parameters as seen by the WIND spacecraft. We confirm that the fluctuations of speed v and
IMF magnitude B are multi-fractal as shown by previous workers, but in addition find that the
fluctuations in the ion density ρ, energy densities B^ 2 and ρ v^ 2 as well as MHD-
approximated Poynting flux vB^ 2 are mono-scaling on the timescales up to~ 26 hours. The …