Jnterimresults ofa current study on upgrading the geosynchronous operational environmental Satellite (GOES) infrared (IR) sounder are presented. Considered are a 15 cm diameter telescope to reduce instrument size and weight, use ofa Fourier Transfonn Infrared (FTIR)inteiferometerfcrhigh spectral wavelength resolution, a small detector focal plane array (FPA) operating at 65K, and combining the ...