Abstract
The results of a moderate drift model with anisotropic perpendicular diffusion for the heliospheric modulation of galactic cosmic rays were compared with electron spectra observed by the Kiel Electron Telescope on board the Ulysses spacecraft for four distinctive periods, 1992, 1995, 1996, and 1997, respectively, for relative large solar activity when Ulysses was at high heliolatitude; mid-latitudes and at low-latitudes with solar minimum modulation conditions. It was found that the model fit all the electron spectra well, except that for 1992, indicating that significant changes occurred between 1992 and 1995 in modulation conditions which must be presented in the model by a large time dependence, and/or a significant variation in the rigidity dependence of the diffusion coefficients. The latter is an aspect that has not been considered seriously in modelling before.
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