Evidence of intermittency in the interplanetary space plasma has been recently pointed out. We present a magnetohydrodynamic (MHD) cascade model, derived from a binomial process, whose results fit the observed scaling law for the qth power of the structure functions. Using this model we modify the oldest Kraichnan theory showing, for the first time, the multifractal structure of fully developed MHD turbulence.

• Received 8 June 1993

DOI:https://doi.org/10.1103/PhysRevLett.71.1546