what is flyby mission?
Operations where spacecrafts are brought within observation range to closely monitor and study astronomical objects.
Jupiter
Beginning in 1973, several spacecraft have performed planetary flyby maneuvers that brought them within observation range of Jupiter. The Pioneer missions obtained the first close-up images of Jupiter's atmosphere and several of its moons. 
where are jet streams located in the atmosphere On earth, near the altitude of the tropopause what are they? Jet streams are fast flowing, narrow, meandering air currents in the atmospheres of some planets. what are the applications of these fast flowing air currents? On Earth, the northern polar jet stream is the most important one for aviation and weather forecasting. these air currents form in any other planets? Yes, on Jupiter for instance how they are formed there? On Jupiter, they are caused by the convection cells that form the familiar banded colour structure and are driven by internal heating. what is the above mentioned planet composed of? Primarily composed of hydrogen with a quarter of its mass being helium. It may also have a rocky core of heavier elements. how is the atmosphere there? It has the largest planetary atmosphere in the Solar System. what time it takes to complete one revolution around the sun? 11.86 years
wiki:11611765
Jupiter [SEP] Flyby missions
Beginning in 1973, several spacecraft have performed planetary flyby maneuvers that brought them within observation range of Jupiter. The Pioneer missions obtained the first close-up images of Jupiter's atmosphere and several of its moons. They discovered that the radiation fields near the planet were much stronger than expected, but both spacecraft managed to survive in that environment. The trajectories of these spacecraft were used to refine the mass estimates of the Jovian system. Radio occultations by the planet resulted in better measurements of Jupiter's diameter and the amount of polar flattening. Six years later, the Voyager missions vastly improved the understanding of the Galilean moons and discovered Jupiter's rings.