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A new high spectral resolution (0.25 cm') and high spatial resolution (2.6 km) scanning (46 km swath width) Fourier Transform Spectrometer (Ff5) has been built for flight on NASA high altitude (-20 km) aircraft. The instrument, called the NPOESS Aircraft Sounding Testbed-Interferometer (NAST-I), has been flown during several field campaigns to provide experimental observations needed to finalize specifications and to test proposed designs for future satellite instruments; specifically, the Cross-track Infrared Sounder (Cr15) to fly on the National Polar-orbiting Operational Environmental Satellite System (NPOESS). NAST-I provides new and exciting observations of mesoscale structure of the atmosphere, including the fine scale thermodynamic characteristics of hurricanes. The NAST-I instrument is described, its excellent spectral and radiometric performance is demonstrated, and surface and atmospheric remote sensing results obtained during airborne measurement campaigns are presented.

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