The radial diffusion cofficient for cosmic rays is calculated using a rudimentary model of the threedimensional solar cavity. Cosmic ray scattering is due to resonant interaction with Alfv¿n waves propagating outwards from the sun according to geometrical optics.In addition the latitude dependence of medium scale fluctuations caused by solar wind streams is considered. The latitudinal extent of the weak modulation region around the pole is found to be about 20¿, although down to about 50¿ latitude significantly higher fluxes are expected. The results also give information on the perpendicular diffusion coefficient. It is quite small. The large intensity gradients in latitude nevertheless may lead to sizeable latitudinal diffusion, although a less pronounced one than in Fisk's (1976) model because of the absence of streams at high latitudes.