Voyager 1 Jupiter Images – Great Red Spot cross sequence

About 20 hours before closest approach Voyager 1 took a 'cross sequence' of images across the Great Red Spot (GRS). This was among other things a supporting observation for the IRIS instrument which was observing the GRS at the same time. The IRIS observations can be seen in an image from a paper in the JGR special Voyager Jupiter issue (the first page of the paper indicates that it is not subject to US copyright so it can be safely included here). Before and after the cross sequence the white oval southeast of the GRS was imaged together with a part of the GRS; this was used to determine wind vectors within the white oval. The oval is one of three similar ovals that were visible during the Voyager encounters - this one was named oval BC. At this high resolution the cloud features change noticeably in 30 minutes or less. This made it necessary to warp the oval images slightly to make it possible to mosaic them seamlessly into the GRS cross sequence. The result is a 28 frame mosaic showing most of the GRS, all of the white oval and some of the areas near the GRS. The images used in the mosaic were obtained by Voyager 1 on March 4, 1979 about 20 hours before closest approach at a range of ~1.25 million km from Jupiter's center.