Simultaneous optical all-sky imager and photometer data from South Pol
e station and the PACE HF radar at Halley, Antarctica from two case st
udies are used to show that their respective ionospheric signatures of
the magnetospheric cusp are collocated to better than about 1 degrees
latitude. The plasma convection reversal as identified in the PACE da
ta is usually observed within the region showing cusp precipitation, a
s expected from contemporary models of this region of geospace.