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NASA UARS Improved Stratospheric and Mesospheric Sounder (ISAMS)

1984 - 1987

Project overview

The Improved Stratospheric And Mesospheric Sounder (ISAMS) on the Upper Atmosphere Research Satellite (UARS) was launched on September 12, 1991 as part of the Mission to Planet Earth programme.

ISAMS is a limb-sounding radiometer which uses a combination of pressure-modulated and wide-band infrared channels to measure Carbon Monoxide, Water Vapour, Nitrogen Dioxide, Nitric Acid, Ozone, Nitric Oxide, Nitrous Oxide, Methane, Dinitrogen Pentoxide, Aerosol, and Temperature in the middle atmosphere. Typically, ISAMS produces vertical profiles of constituents and temperature every 200 km along the tangent track, with an instantaneous field of view of about 2.4 km vertically. ISAMS made measurements, with several significant gaps, between 80 S and 80 N from 26 September 1991 to 29 July 1992.

Delivered hardware

Description Filter Type Quantity Wavelength Region Substrate Material Dimensions
Filters Narrow bandpass filters 14 channels 4.6 - 16.3 µm Germanium (Ge) 25.4mm Dia Asphere
Beamsplitters Longwave-pass edge filters 6 channels 5.5 - 9.2 µm Germanium (Ge) 36.0 - 42.0mm Dia Asphere