The Cryogenic Limb Etalon Array Spectrometer (CLAES) aboard the Upper
Atmosphere Research Satellite (UARS) has made global observations of s
tratospheric aerosol during 1992. The instrument and measurement techn
ique are briefly discussed. Samples of CLAES aerosol observations for
south-looking days through the course of the Antarctic winter showing
evolution of polar stratospheric clouds (PSCs) and the Pinatubo volcan
ic veil axe shown and discussed.