Science Findings

12.03.20

JunoCam Monitors Evolution of Circumpolar Cyclones

Juno discovered 8 cyclones positioned in the form of an octagon around the north pole and 5 forming a pentagon around the south pole.

JunoCam images show that the constellation of circumpolar cyclones has remained stable since discovery 2 years ago.

Individual cyclone observed repeatedly

Each southern cyclone is ~4000 km wide with velocities first increasing then decreasing from the center outwards, similar to Earth’s hurricanes.

JunoCam images from orbits 1-15 track cyclones and measure velocities

Wind velocities measured in collaboration with citizen scientists ~100 m/sec, among the highest measured for cyclones on Jupiter.

Pentagonal pattern of southern cyclones slowly drifts westward by ~0.04 m/s (0.14 km/hr).
Juno discovered 8 cyclones positioned in the form of an octagon around the north pole and 5 forming a pentagon around the south pole. 

Credit: Tabataba-Vakili, F., J., et. al., Icarus, in press, 2019.
Download JunoCam Monitors Evolution of Cirumpolar Cyclones here