  The magnetospheric cusps are important sites of the coupling of a
magnetosphere with the solar wind. The combination of both ground- and
space-based observations at Earth have enabled considerable progress to be made
in understanding the terrestrial cusp and its role in the coupling of the
magnetosphere to the solar wind via the polar magnetosphere. Voyager 2 fully
explored Neptune's cusp in 1989 but highly inclined orbits of the Cassini
spacecraft at Saturn present the most recent opportunity to repeatedly studying
the polar magnetosphere of a rapidly rotating planet. In this paper we discuss
observations made by Cassini during two passes through Saturn's southern polar
magnetosphere. Our main findings are that i) Cassini directly encounters the
southern polar cusp with evidence for the entry of magnetosheath plasma into
the cusp via magnetopause reconnection, ii) magnetopause reconnection and entry
of plasma into the cusp can occur over a range of solar wind conditions, and
iii) double cusp morphologies are consistent with the position of the cusp
oscillating in phase with Saturn's global magnetospheric periodicities.
