Improved Limb Atmospheric Spectrometer (ILAS)

Program overview, scientific targets and instrument design of the Improved Limb Atmospheric Spectrometer (ILAS) is described. The ILAS has two grating spectrometers for solar occultation measurement: one is for measurement of infrared band (850-1610 cm -1 , 11.76 micrometers - 6.21 micrometers ) for O 3 , HNO 3 , NO 2 , N 2 O, H 2 O, CH 4 and CFC11, and the other is for visible band (753-784 nm, O 2 A band) for aerosols, temperature and air density measurement. ILAS will be onboard the ADEOS spacecraft and will observe high-latitude (N55-70, S63-87) ozone layer after February 1996 over 3 years with high vertical resolution (less than or equal to 2 km).