Abstract
Improved Limb Atmospheric Spectrometer (ILAS), which was developed by Environment Agency of Japan, was a satellite‐borne sensor to observe chemical and dynamical environment of the stratospheric ozone layer from space. ILAS had been normally operating on board the Advanced Earth Observing Satellite (ADEOS) from the beginning of November 1996 to the end of June 1997 when the sudden failure of ADEOS solar battery system happened. Using the solar occultation technique, the ILAS measured vertical profiles of ozone (03) and ozone‐related species such as nitric acid (HNO3), nitrogen dioxide (NO2), nitrous oxide (N2O), methane (CH4), and water vapor (H2O). It also measured vertical profiles of atmospheric temperature and pressure as well as aerosol extinction coefficient at 780 nm. Extinction coefficients in the infrared wavelength region were also derived and used to infer aerosol types and extinction spectra over the whole infrared channels. ILAS‐derived data will be used for better understanding of the stratospheric ozone layer changes.
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