ILAS, THE IMPROVED LIMB ATMOSPHERIC SPECTROMETER, ON THE ADVANCED EARTH OOBSERVING SATELLITE

Overview of Improved Limb Atmospheric Spectrometer (ILAS) instrument d esign, band selection studies, and operation plan is described. The IL AS is a solar occultation instrument onboard ADEOS spacecraft with two grating spectrometers: one is for measurement for O-3, HNO3, NO2, N2O , H2O, CH4 CFC11 and CFC12 in the infrared band (850-1610 cm(-1), 11.7 6 mu m-6.21 mu m), and another is for aerosols, temperature and air de nsity measurement in the visible band (753-784 nm, O-2 atmospheric A b and). The ILAS will observe the ozone layer over high-latitudes (N55-7 0, S63-87) regions with a high vertical resolution (less than or equal to 2 km) for a period of 3 years after launch in 1996.