performs updown correction:
updowncal ideally corrects for differences in up and downscans:
- since the difference in behaviour between up and downscans is not known,
as in the pipeline, nothing is done(!)
- due to memory effects large differences between up and downscan appear for
high flux levels
Cal-files: none
Help text: IA utilities
Alternative:
Comment:
For low flux updown1_inter and updown_inter remove slopes in the data
remaining from imperfect dark subtraction by an internal flatfielding of up
and downscan (correction mode: both). For high fluxes, they can be
used to remove some of the memory effects (correction mode: up) by
mapping the upscan (which, after a dark, has to get used to the high flux
level) onto the downscan (which already starts on a high flux level and
therefore is less affected by memory effects).
SWS TUTORIAL /
PIPELINE /
SPD to AAR : ...
dark <
updowncal <
respcal ...
Last update: 30-Jul-1998 by D. Kunze ( mail to:
isodata@mpe.mpg.de )