Applying a basic filtering algorithm, the sharpness of this image was further enhanced. However, the Tvashtar outburst is quite anomalous and has lasted more than one year. The Galileo spacecraft observed the onset of this eruption, and twice again this year. It will be employed for a large variety of astronomical programmes and will, among others, allow the detection and frequent monitoring of a large number of hot spots on the surface of Io . The real observing time is twice as much, with half of the time spent in the off-target chop position.
North is up and East is left.
They appear as wavy curtains of light that follow the magnetic field lines at high latitude and they surround the north and south magnetic poles as a permanent, but variable ring of light . The reasons for this are also known. The capability to perform such studies from the ground with a quality approaching that from space now promises dramatic improvement in our understanding of Jovian auroral processes and, equally important, the possible to compare them with those on the Earth. There are other light emission mechanisms on Jupiter than the aurorae. Clouds are present in Jupiter's stratosphere that efficiently reflect the sunlight and which are responsible for the overall brightness of Jupiter's disk.