A mesospheric ozone profile at sunset

An altitude profile of the ozone concentration from 55 to 95 km was measured at sunset in January by simultaneous measurements of the 1.27 μm radiation and the solar UV radiation using rocket-borne radiometers at Uchinoura, Japan (31°N). The ozone profiles deduced by two different methods agree with each other at approximately 70 km. The profile was consistent with our previous results obtained at the same station in September, and with the sunset profile obtained at Wallops Island (38°N) during the WMO/FAA/NASA international ozone rocketsonde intercomparison. Our data show no seasonal variation of ozone in the 55 – 95 km region at Uchinoura.