FOS IDT	Report RSDP/FOS004 Sky Subtraction

R.Downes, D.Weistrop

1988 tiay 2


1. Introduction


The algorithms which perform sky subtraction for FOS data in the
Science Operations Ground System/Routine Science Data Processing
Pipeline (SOGS/RSDP) was tested using the CALFOS prograzn running in
the IRAF/SDAS environmeflt. All tests were performecl using synthetic
data generated by the CONPSPEC and TSPECTRUM programs. The software,
in all cases, produces the proper answers, although one problem in the
system was uncovered. There is also at least one case in which the
software satisfies the requiremerlts in DRDSOGSSE061 (hereafter SE06)
hut does not perform in a scientifically valid inanner.


This report describes the test procedures used to validate the RSDP
algorithnts (Sec. II) and the results of those tests (Sec. IIIV). In
Sec. VI we discuss the results, in which we Und that all aspect: of
sky subtraction perform as specified in S~Q6. In Sec. VII we
suinmarize our conclusions concerning the sky subtraction tests, and
in Sec. VIII we discuss our values for the initial population of the
Calibration Database.