These investigations, although providing no hardware of their own, combine data from several Ulysses experiments to study specific scientific questions of relevance to the mission.
This investigation looks at large- and small-scale plasma irregularities or inhomogeneities in the solar wind, which is not the well-behaved, uniform medium normally considered by theoreticians. Depending on the type of variation shown by the magnetic-field and plasma parameters, a directional discontinuity can be either a tangential discontinuity, a shock, or a true rotational discontinuity. New theoretical models of these phenomena are developed as part of the Ulysses investigation, and the magnetic-field and plasma observations obtained by Ulysses are used to check these models and identify fundamental plasma-physical processes.
Mass Loss and Ion Composition
This investigation studies the dependence of coronal mass loss on heliographic latitude, with a view to improving the understanding of the energy and momentum balance of the outer layers of the Sun. Secondly, a search is made for a latitudinal dependence of the solar wind ion composition.