Since its launch on September 12, 1991 from the Space Shuttle Discovery, the Halogen Occultation Experiment (HALOE) has been collecting profiles of middle atmosphere composition and temperature on board the Upper Atmosphere Reseach Satellite (UARS). HALOE uses solar occultation to measure simultaneous vertical profiles of Ozone (O3), Hydrogen Chloride (HCl), Hydrogen Fluoride (HF), Methane (CH4), Water Vapor(H2O), Nitric Oxide (NO), Nitrogen Dioxide (NO2), Temperature, Aerosol Extinction at 4 infrared wavelengths, Aerosol composition and size distribution versus atmospheric pressure with a 1.6 km instantaneous field of view at the Earth's limb.

HALOE Website:

http://haloe.gats-inc.com