The Solar Wind Ion Composition Spectrometer (SWICS) on Ulysses is
designed to determine uniquely the elemental and ionic-charge
composition, and the temperatures and mean speeds of all major
solar-wind ions, from H through Fe, at solar wind speeds ranging from
175 km/s (protons) to 1280 km/s (Fe+8). The instrument, which covers
an energy per charge range from 0.16 to 60 keV/e in ~13 min, combines
an electrostatic analyzer with post-acceleration, followed by a
time-of-flight and energy measurement.
The Ulysses spacecraft was launched in 1991 into an extended orbit
around the Sun and Jupiter, rougly orthogonal to the ecliptic plane.
This allowed Ulysses to make the first ever measurements over the
poles of the Sun.