It was of a similar design to the very successful imager on the Swedish Viking satellite. The camera was mounted at 90 to the platform spin axis with the CCD columns shifted electronically at a rate selected to exactly correct for the satellite spin motion. Unfortunately, the actual motion of the Interball Auroral Probe was more complicated than expected. UVAI images are affected in various ways by the wobble, depending on the amplitude and phase of the coning motion during any particular frame.
Some images suffer little or no degredation.
Figure 1 shows four frames from both camera 0 and 1 collected during orbit 560. It should be noted that the amount and orientation of smearing varies between cameras and frames. Auroral features are also modified, significantly reducing the quality and usefulness of the images. Blur direction and amount varies between cameras and frames. This report presents image restoration techniques that can be used to correct for smearing or deblurring.