Abstract
Ground-based observations of solar ultraviolet (UV) radiations have been carried out in Tokyo, Japan, São Martinho da Serra, Brazil, and Punta Arenas, Chile. The initial results showed that the observations were concerned with the total amount of ozone. Variations in the flux ratio between UV-B and UV-A radiation in both hemispheres show a clear anti-correlation with the amount of ozone along line-of-sight. As a result of least-square fitting, exponential functions between the UV-ratio (UV-B/UV-A) and effective ozone are obtained. Radiometer data at Punta Arenas also show sudden enhancement of UV-B radiation in the beginning of spring, indicating that the arrival of the ozone hole can be detected from the ground.
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