NASA said: “In this Hubble telescope picture, a curtain of glowing gas is wrapped around Jupiter’s north pole like a lasso. This curtain of light, called an aurora, is produced when high-energy electrons race along the planet’s magnetic field and into the upper atmosphere where they excite atmospheric gases, causing them to glow. The aurora resembles the same phenomenon that crowns Earth’s polar regions.” Image via NASA/ ESA/ John Clarke (University of Michigan)/ SwRI.
Scientists from the Southwest Research Institute (SwRI) based in San Antonio, Texas, said on March 29, 2021, that they’ve successfully used the Juno spacecraft to discover never-before-seen features associated with Jupiter’s aurora. They called them:
… faint ring-like aurora features … expanding rapidly over time.
The expanding rings are about 1,200 miles (2,000 km) across, and they race outward at speeds of approximately 3 miles (5 km) a second.
Ultraviolet images, shown here in false color, captured the rapidly expanding auroral rings on Jupiter. Image via NASA/ JPL-Caltech/ SwRI/ V. Hue/ G. R. Gladstone.
These rings, bright in ultraviolet light, appear to have a different origin from other auroral features on Jupiter, which are generated by internal processes, that is, via the motion of charged ...