Tethered Balloon Radiometric Data A cube with sensor all six sides measuring hemispherical radiation in all directions was suspended about 30 meters below a tethered 9m3 balloon. The radiometer was produced and calibrated by the Norwegian Institute for Air research. Additional payload was a cloud particle videometer. Data from the videometer are submitted separately by Randy Borys of DRI. Due to cable failure, a short in the radiometer communication occurred that destroyed the data loggers ability to poll the radiometer. Due to this problem we have only 4 data files with good data, most containing one ascending and one descending profile. The data was collected between 09/14/1998 and 09/21/1998. The submitted files contains raw counts and have to be multiplied with the calibration factors given below to obtain engineering units which are mW/m^2. The calibration procedure is described in : Dahlback, A. "Measurements of biologically effective UV doses, total ozone abundances, and cloud effects with multi-channel, moderate bandwidth filter instruments", Appl. Opt., vol. 35, 6514-6521, 1996. Uncertainty is calculated to be ±10%. . The sensor heading directions indicated in the file header are not absolute directions but relative to the other sensors. Center wl.(nm) Top North East ------------------------------------------------------- 500.9 5.597767e-3 4.757576e-3 3.849874e-3 802.0 4.124353e-3 4.449633e-3 4.090312e-3 Center wl.(nm) South West Bottom ------------------------------------------------------- 500.9 5.639296e-3 7.377252e-3 3.709928e-3 802.0 4.847719e-3 4.610574e-3 4.133021e-3 More detailed information from the instrument logs will be made available on request. Please send questions regarding this system or the dataset to: Rune Storvold Geophysical Institute, University of Alaska Fairbanks 903 Koyukuk Dr. P.O.Box 757320 Fairbanks, Alaska 99775-7320 USA E-mail: Rune.Storvold@gi.alaska.edu Phone: (907) 474-6639 FAX: (907) 474-7290