From the hourly counting rate of the Deep River neutron monitor we have calculated the magnitude and phase of the diurnal anisotropy, and from them we have inferred the magnitude and direction of cosmic ray diffusion on a daily basis. These data are compared with observed interplanetary magnetic field data, and we conclude that the diffusion is field aligned (within observational uncertainties) on essentially all days which are separated from sector boundaries. Days in which diffusion does not appear field aligned are characterized either by sector boundaries or by poor statistical accuracy.