Computer Science – Software Engineering
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hstx.reptq....c&link_type=abstract
Technical Report, Hughes STX, Inc. Lanham, MD United States
Computer Science
Software Engineering
Solar Activity, Solar Backscatter Uv Spectrometer, Solar Cycles, Solar Radiation, Solar Spectra, Unix (Operating System), Workstations, Spacecraft Orbits, Drift (Instrumentation), Noaa 2 Satellite, Noaa 9 Satellite, Software Engineering
Scientific paper
The primary purpose of this research is to develop a NOAA11 SBUV/2 solar spectral irradiance data set which is free from long-term instrument drift, then perform scientific analysis using the data set. During this period of performance, we have transferred the analysis software and data from an IBM mainframe computer to a UNIX workstation, have been updating the NOAA-11 SBUV/2 characterization, and have further refined the SSBW calibration, each step which must be completed before the long-term calibration of the SBUV/2 solar spectral irradiance data set can be completed. As a check on software and analysis procedures, a preliminary NOAA-11 Mg II index was developed for the period Febuary 1989 through the end of the data record, October 1994. The index is considered preliminary because a preliminary instrument calibration was used. The Mg II proxy index shows a 5-6% decrease in the mean level of middle ultraviolet solar activity from early 1992 through late 1994, corresponding to the declining phase of solar cycle 22. The gaps in 1993 and 1994 are the result of the near-terminator spacecraft orbit during this period. A NOAA-9 SBUV/2 Mg II proxy index, constructed using a preliminarY calibration of that instrument and normalized to the NOAA-11 index, was used to fill these gaps and extend the data record into early 1995. The result of this procedure is presented. Solar activity remained low during this period.
Cebula Richard P.
DeLand Matthew T.
Hilsenrath Ernest
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