  Based on the Langevin equation of Brownian motion, we present a simple model
that emulates a typical mode in incompressible magnetohydrodynamic turbulence,
providing a demonstration of several key properties. The model equation is
consistent with von K\'arm\'an decay law and Kolmogorov's symmetries. We
primarily focus on the behavior of inertial range modes although we also
attempt to include some properties of the large scale modes. Dissipation scales
are not considered. Results from the model are compared with results from
published Direct Numerical Simulations.
