LiveLeak’s MR_rusty made a compilation of some nuclear bomb exploding in the space. Several such tests were performed by the United States and the Soviet Union between 1958 and 1962.
Nuclear effects in space have a qualitatively different display. While an atmospheric nuclear explosion has a characteristic mushroom-shaped cloud, high-altitude and space explosions tend to manifest a spherical ‘cloud,’ reminiscent of other space-based explosions until distorted by Earth’s magnetic field.
The charged particles resulting from the blast can cross hemispheres to create an auroral display. That is why they were characterized as ‘the rainbow bombs’. The visual effects of a high-altitude or space-based explosion may last longer than atmospheric tests, sometimes in excess of 30 minutes.