Abstract
We have developed a balloon-borne optical ozone sensor and since 1994 have observed the vertical distribution of upper stratospheric ozone in summer using a thin-film high-altitude balloon at Sanriku, Japan. The sensor measures solar ultraviolet radiation in ozone Hartley band absorption at wavelength of 300 nm, and vertical ozone distributions higher than 15 km were obtained with 1 km resolution. The temporal variations of ozone concentrations above 30 km from 1994 to 2007 show correlations with 11-year variation of solar F10.7 flux and we could not detect decreasing or increasing trends.
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