EXPERIMENTAL-EVIDENCE FOR DIFFERENCES IN THE EXTENDED SELF-SIMILARITYSCALING LAWS BETWEEN FLUID AND MAGNETOHYDRODYNAMIC TURBULENT FLOWS

It has been recently suggested that the various qth order velocity str ucture functions in turbulent flows are related to each other through well defined scaling laws, which extend outside the usual inertial dom ain. Even if theoretical models provide different scaling laws for flu id and magnetohydrodynamic turbulent flows, no attempt has been made u p to now to furnish experimental evidence for these differences. By us ing measurements from the solar wind turbulence and from turbulence in ordinary fluid flows, we show that the differences can be observed on ly by looking at the high-order velocity structure functions.