Cassini dust stream particle measurements during the first three orbits at Saturn

摘要: [1] Stream particles are nanometer-scale dust ejected with speeds ≳100 km s−1 from both the Jovian and Saturnian systems. Here we report dynamical analysis of stream on basis observations made by Cosmic Dust Analyzer board Cassini spacecraft during its first three orbits around Saturn. The time span presented measurements covers beginning orbit A to end C (from Saturn insertion 1 July 2004 UTC 16 January 2005 UTC). During these was usually located outside but not far Saturn's magnetosphere. therefore provide important information dynamics just system. As earlier observations, two impact populations identified. These appear as faint continuous impacts well semiregular energetic bursts. Faint directions close line sight recognized recently particles, while bursts most probably consist previously that experienced significant acceleration within solar wind. only confirm previous proposed particle ejection scenario also serve essential inputs for detailed modeling.