Calibration Access and Data Handbook


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Generation from Ground Calibration Data

A spatial and spectral information of the zodiacal light emission is taken from literature: The spatial distribution of the zodiacal light is contained in the ZODIACAL_MAP extension. Helioecliptic coordinates are used.
The zodiacal light spectrum (essentially solar) is compiled from literature and written into the extension ZODIACAL_SPEC. The intensity of the spectrum is scaled to the reference intensity. The photon rates are estimated by folding the zodiacal light spectrum with the OM response. The binary table ZODIACAL_CTS lists the expected photon rates for the different filters at the reference intensity.

Image extension: ZODICAL_MAP
keyword keyword keyword comment
name type value  
BITPIX integer -32 number of bits per data pixel
NAXIS integer 2 number of data axes
NAXIS1 integer may vary length of data axis 1
NAXIS2 integer may vary length of data axis 2
BUNIT string S10(V) Units of the image
CTYPE1 string 'ecliptic longitude / [deg]' name of x-axis
CTYPE2 string 'ecliptic latitude / [deg]' name of y-axis
CRVAL1 real may vary [degree] x-coordinate of reference bin
CRVAL2 real may vary [degree] y-coordinate of reference bin
CRPIX1 integer 1 [bin] address of reference bin x-direction
CRPIX2 integer 1 [bin] address of reference bin y-direction
CDELT1 real may vary [degree] increment in x-direction
CDELT2 real may vary [degree] increment in y-direction

Binary table: ZODICAL_SPEC
keyword keyword keyword comment
name type value  
REFINTEN real may vary reference intensity of spectrum [S10(V)]
column name column type column unit comment
LAMBDA E nm wavelength of bin
FLUX E $W/m^2/nm/deg^2$ zodiacal light flux at reference intensity

Binary table: ZODICAL_COUNTS
keyword keyword keyword comment
name type value  
REFINTEN real may vary reference intensity of count rates [S10(V)]
column name column type column unit comment
FILTER_ID 9A - filter identifier
COUNTS E photons/sec/subpixel photon rate at reference intensity


next up previous contents
Next: Generation from In-Orbit Data Up: ZODIACAL Previous: Description   Contents
Michael Smith 2011-09-20