The Solar Blind Channel contains the MAMA detector. It is centered close to the HRC position in the V2V3 plane and has a slightly larger field of view, about 35 by 31 arcseconds. The scales and distortions have now been measured directly. The maximum distortion displacement is about 2 pixels or 0.06 arcseconds. The HRC and SBC both have much smaller areas than the WFC. In the x direction the scale is 0.0338 arcseconds/pixel while in the y direction it is 0.0301 arcseconds/pixel. Like the HRC, the SBC exhibits a 13% difference between x and y scales with a variation across the aperture of a little over 2%.
Figure 10.129: HRC distortion.
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