... In the WFPC2 images, the pyramid edge shadow is not visible in the scattered light; the light is spread out to the chip edges, indicating that most of the scattering occurs after the pyramid. ...
... If you wish to acquire a faint target with the least Ly-a contamination, we suggest that you specify SHADOW as a Special Requirement in Phase II. ...
... WFPC2 flat fields also include instrumental effects such as vignetting and shadowing by dust particles, and illumination variations related to optical geometric distortion. ...
... Because the particle-induced background generates photons, its spatial distribution looks like a flatfield, except the shadows at the edges of the field caused by obstructions in the FOC beam between the aperture plate and the photocathode are not present ...
... Scheduling when geocoronal lines are weak can be requested in a Phase 1 proposal, and if approved, specified in the Phase 2 proposal using the SHADOW special requirement. ...
... Reference File Changes: . ? . The FUV bad pixel table now has an OPT_ELEM column to allow accurate flagging of the repeller wire shadow on the FUV-MAMA. ...
... In the WFPC2 images, the pyramid edge shadow is not visible in the scattered light; the light is spread out to the chip edges, indicating that most of the scattering occurs after the pyramid. ...