Decay of magnetic field irregularities observed by Ulysses

We study the solar cycle, radial, and latitudinal dependence of the charact eristics of magnetic field irregularities in the Heliosphere. The frequency of magnetic field discontinuities is determined, using high time resolutio n magnetic field observations by Ulysses, covering the time interval from 1 992 to 2000. The quasi-linear scattering mean free path of particles is als o calculated. These investigations aim at understanding/exploring transport properties of energetic charged particles in the Heliosphere. We find that the travel time of solar wind plasma from the Sun to the observer is the k ey parameter of the process, by controling the decay of the irregularities.