Next: 7.4 Flux Resampling Algorithm
Up: 7.3 Additional Corrections for
Previous: 7.3.2 Wavelength and Spatial
Localized discontinuities (wiggles) in the spatial direction are also
detectable in high-dispersion images for all three cameras. Corrections,
similar to those developed in low dispersion for the long-wavelength
cameras, have been derived which map out these distortions present in
every order. The SWP wiggles demonstrate a time dependency in patchy
areas on the camera surface. Therefore, two SWP correction templates
have been derived: one for early-epoch (before 1988 January 02) images,
the other for late-epoch (after 1990 January 02) data. Wiggle
corrections are interpolated linearly for SWP high-dispersion images
obtained between these two dates. The LWP and LWR cameras have only
single-epoch correction templates. The wiggles among the SWP images
correlate well enough that a mean-wiggle template removes at least half
the amplitude of the excursions in an individual image. The wiggles
present in long-wavelength images are not as well correlated.
Karen Levay
12/4/1997