Each loop in this video represents approximately 10 Earth hours or one Jupiter day, approximating what it would look like if the Great Red Spot were constantly illuminated. By analyzing this set of data from NASA’s Hubble Space Telescope, researchers were able to simulate what the wind flow looks like around Jupiter’s Great Red Spot: Just south of the Great Red Spot is an eastward jet and at the southern border is a westward jet.
By analyzing images taken by NASA's Hubble Space Telescope from 2009 to 2020, researchers found that the average wind speed just within the boundaries of the Great Red Spot, set off by the outer green circle, have increased by up to 8 percent from 2009 to 2020 and exceed 400 miles per hour. In contrast, the winds near the storm's innermost region, set off by a smaller green ring, are moving significantly more slowly. Both move counterclockwise.
Credits: NASA, ESA, Michael H. Wong (UC Berkeley)
The massive storm's crimson-colored clouds spin counterclockwise at speeds that exceed 400 miles per hour – and the vortex is bigger than Earth itself. The red spot is legendary in part because humans have observed it for more than 150 years.