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Instrumentation

Observations at Punta Arenas with a Brewer spectrophotometer have been made since 1992 by INPE ­ National Institute of Space Research of Brazil, and Universidad de Magallanes (Kirchhoff et al., 1997a, 1997b). Total ozone is determined from direct UV-B observations at 5 wavelengths ­ 306.3, 310.0, 313.5, 316.7 and 320. 1 nm. Global UV-B measurements are also made, in the range 290-325 nm.  At Ferraz Station, a Ground-based ultraviolet radiometer ­ GUV, was used, which measures global narrowband UV radiation at 305, 320, 340 and 380 nm. Observations and typical variations are reported by Paes Leme et al. (2000). Total ozone over Ferraz Station was obtained from TOMS observations.