1. NOAA Ozone Photometer Josh Ballard NOAA Earth System Research Laboratory and Cooperative Institute for Research in Environmental Sciences Boulder, Colorado

2. NOAA Dual-Beam UV Absorption Ozone Photometer Data rate: 1 Hz Accuracy: 3% + precision Precision: 1.5 x 10 10 molecules cm -3 Dimension: 30” x 14” x 7” Weight: 57 lbs. Flown on NASA ER-2, WB-57F aircraft, and NCAR HIAPER Now reports O 3 mixing ratio every 10 s via a TTL port Format: CLJJJTTTTTT,PPPP.PP,OOO.OO at 9600 baud Ccarriage return Lline feed JJJJulian day TTTTTTUtSeconds PPPP.PPambient pressure in mb OOO.OOozone mixing ratio

3. = 253.7 nm NOAA Dual-Beam UV Absorption Ozone Photometer Air In

4. Lamp Housing Detector Housing 40 cm Sample cells Computer / Electronics Stack FlashCard Storage disk Dual-Beam UV Absorption Ozone Instrument M. Proffitt & R. McLaughlin, Rev. Sci. Instrum., 54, 1719, (1983)