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The infrared atmospheric band airglow radiometer (IRA) was flown aboard the satellite OHZORA to measure the mesospheric ozone profile by using the O21.27 ƒÊm emission from the atmospheric limb. The IRA also measures the CO215 ƒÊm radiation with the thermistor bolometers to get information on the satellite attitude and the tangential heights of the line of sight of the sensors. Some radiance profiles of the limb at two wavelengths were obtained in February and March 1984, when the thermistor data confirmed the satellite was being kept without a spinning motion. The dedueced mesospheric ozone profiles are compared with Krueger and Minzner mid-latitude ozone model and the SME satellite data. A difference between the profile around a latitude of 60•‹S and that around 50•‹S exists above about 75km height, and the latter profile seems to be similar to the mid-latitude one. The density in the heights 7595 km around 60•‹S shows an almost constant value of about 5 •~107 cm-3.

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