I’m just prepping another post at the moment but came across this great animation on my travels. It shows Jupiter as seen from the Chandra satellite, which captures X-Ray information. As you see from the (hopefully moving) picture below, Jupiter is mostly invisible when seen in the X-Ray. You can however see some dancing spots at each pole. These are aurora happening on Jupiter. This image was taken in December 2000 but other images of aurora on Jupiter have also been snapped.
Aurora occur when high energy particles from the Sun interact with the atmosphere. Here on Earth they are called the Northern or Southern lights or Auroa Borealis/Australis.