NOAA-9 SBUV/2 Solar Spectral Irradiance Data February 13, 2007 ############################################ This file briefly summarizes the NOAA-9 SBUV/2 solar spectral irradiance data product. The SBUV/2 instrument measured solar irradiance on an approximately daily basis with 1.1 nm resolution. The data provided here are daily average solar spectra over the wavelength range 170-400 nm in 1 nm bins, covering the time period March 14, 1985 to May 5, 1997. The data have been fully corrected for long-term instrument calibration changes. A complete description of the data processing procedure can be found in DeLand et al. [J. Geophys. Res., 109, D06304, doi:10.1029/2003JD004074, 2004], and on this web site as 'n09_irrad_jgr_2004.pdf'. The NOAA-9 SBUV/2 irradiance data are intended for use in studies of short-term and long-term solar UV variability. The estimated long-term accuracy of the data is 2.3% (2 sigma) at 205 nm, and 1.8% at 250 nm. Two binary data files and two IDL programs to examine the data are provided. 'n09_dates_daily.unf' contains the date (year, day of year, running day number from 1 January 1985) for every available spectrum. 'n09_spec_daily.unf' contains the corresponding spectra (170-400 nm, 1 nm bins, units of mW/m^2/nm). The program 'n09_spec_public.pro' will plot any available NOAA-9 SBUV/2 irradiance spectrum. 'n09_time_public.pro' plots a time series of irradiance data averaged over a selected wavelength band. For a better view of the data gaps caused by satellite orbit drift, the user may prefer 'n09_time_public_gap.pro' and its associated subroutine 'plot_data_gap.pro'. If ASCII files are more convenient, please use 'n09_dates.dat' (year, day of year, running day number) and 'n09_irrad.dat' (10 column x 23 row irradiance data block for each spectrum). Solar UV spectral irradiance data from two other SBUV and SBUV/2 instruments are also available. Data from Nimbus-7 SBUV covering the period November 1978 to October 1986 are available in the binary data files 'n07_dates_daily.unf' and 'n07_spec_daily.unf', or in the ASCII files 'n07_dates.dat' and 'n07_irrad.dat'. Data from NOAA-11 SBUV/2 covering the period December 1988 to October 1994 are available in the binary data files 'n11_dates_daily.unf' and 'n11_spec_daily.unf', or in the ASCII files 'n11_dates_v1.dat' and 'n11_irrad_v1.dat'. The format of these files is identical to the corresponding NOAA-9 SBUV/2 data files. Further information about the long-term characterization of these data sets can be found in the following papers: * Cebula et al. [JGR, 103, 16,235-16,249, 1998]; NOAA-11 part 1 * DeLand and Cebula [JGR, 103, 16,251-16,273, 1998]; NOAA-11 part 2 * DeLand and Cebula [JGR, 106, 21,569-21,583, 2001]; Nimbus-7 Contact Information =================== Matthew DeLand Science Systems and Applications, Inc. (SSAI) 10210 Greenbelt Rd., Suite 600 Lanham, MD 20706 Ph. (301) 867-2164 E-Mail: matthew_deland@ssaihq.com Web: http://ventus.gsfc.nasa.gov/solar.html DATA: http://ozone.sesda.com/solar/