Detailed Features of Neptunian System

Ground-based observations of Neptune are quite limited. Using early imaging technique, the existence of considerable wind in the Neptunian atmosphere was detected. Using Voyager-2 measurements detailed features of atmospheric processes were reported. After Uranus encounter, the Voyager-2 altitude control system was improved that permitted closer scanning of Neptune and Triton. Extensive searches for new satellites were made and several new satellites were discovered. Considerable amount of methane and hydrogen are present in the Neptunian atmosphere. The condensable were found to enhance by a factor of ten relative to hydrogen and helium abundances in Sun's atmosphere. Some of the details of Triton's ionosphere are also shown. Solar wind interacts with the Neptune's ionized region and forms magnetosphere.