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tokens: We thank the Ulysses project at ESA and NASA/JPL for effective and successful mission operations and an anonymous referee for improving the presentation of our results. H.K. is also grateful to Klaus Hornung for valuable discussions during the preparation of this manuscript. This research was supported by the German Bundesministerium für Bildung und Forschung through Deutsches Zentrum für Luft-und Raumfahrt e.V. (DLR, grant 50 QN 9107). H.K. and P.S. gratefully acknowledge support by MPI für Sonnensystemforschung. P.S. acknowledges support by Deutsche Forschungsgemeinschaft (DFG) grant KR 3621/1-1. Facility: Ulysses .