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Image name: AlMg_stray_vs_ATT.png (click image to enlarge)
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Date submitted: 04-Nov-1996
4-Nov-96
L. Acton
VARIATION OF AlMg STRAYLIGHT WITH POINTING
The data shown here were taken from just over 100 Dagwood images with
the same nominal (3 arcmin west offpoint) pointing. The raw
(sxt_compressed) signals were averaged over the areas indicated on the
figure. The data were not decompressed nor dark-corrected because of
memory limitations -- but it doesn't make any difference for this analysis.
I conclude the following from examination of these data for AlMg:
1) A straylight change of 1 DN corresponds to a pointing
shift in either X or Y of roughly 4 FR pixels or 10 arcsec.
2) The correlation of AlMg straylight intensity is stronger
with X than with either Y or sqrt(Y^2 + X^2).
I recommend a value of 5 for the AlMg Dlt-Pnt parameter in mk_sfc.param.
A compressed genx file with all the plots from this work is in
/ys/sxt/doc/AlMg_stray_vs_ATT.genx.Z
