Analysis of Solar Spectral Irradiance Measurements from the SBUV/2-Series and the SSBUV Instruments

Details Analysis of Solar Spectral Irradiance Measurements from the SBUV/2-Series and the SSBUV Instruments Analysis of Solar Spectral Irradiance Measurements from the SBUV/2-Series and the SSBUV Instruments

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hstx.rept.....c&link_type=abstract

Technical Report, Hughes STX, Inc. Lanham, MD United States

Physics

Noaa 9 Satellite, Solar Activity, Electromagnetic Measurement, Ultraviolet Emission, Spectrum Analysis, Solar Spectra, Solar Radiation, Solar Backscatter Uv Spectrometer, Periodic Variations, Daytime, Cycles

Scientific paper

The NOAA-9 SBEV/2 instrument has made the first regular measurements ot solar UV activity over a complete solar cycle, beginning in March 1985 and continuing as of this writing. The NOAA-9 solar irradiance data set includes the minimum between Cycles 21-22 and the current minimum at the end of Cycle 22. Although overall solar activity is low during these periods, 27-day rotational modulation is frequently present. The episode of 13-day periodicity observed during September 1994 - March 1995 shows that phenomena previously associated with high levels of solar activity can occur at any point in the solar cycle. The 205 nm irradiance and Mg II index measured by NOAA-9 showed very similar behavior during the Cycle 21-22 minimum in 1985-1986, when 27-day periodicity dominated short-term solar variations, but behaved differently in 1994-1995 during the episode of 13-day periodicity. We plan further investigations into the physical causes of this result, since it affects the extent to which the Mg II index is an accurate proxy for 205 nm irradiance variations during such episodes. The NOAA-9 Mg II data are available.

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