The evolution of the total ozone measured by a network of ground stations located in Argentina and Chile between latitudes 53S and 33S during the spring of 1993, 1994 and 1995 is given. Ozone data obtained from the ground stations are compared with total ozone values supplied by the satellite showing a very good agreement. Ground station data were taken with a very low cost detection system based on differential optical absorption techniques under specific conditions. Several ozone depletion events were detected in the south of Argentina and Chile during those time intervals, even at latitudes as low as 33S. Potential vorticity maps obtained for those events indicate that the ozone depletions observed have an Antarctic origin.

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Abstract-A pulaed xenon ion luer with an output power or I kW over the blue-green lines was used to pump an open dye stream laser.An efficiency or the order or 40 percent was determined in broad· band mode operation. The bandwidth in this cue was 48 nm (from 582 to 630 nm).