What is causing Jupiter’s Great Red Spot?
Jupiter is a gaseous/fluid planet with rapid rotation, which causes the winds to organise into bands of easterlies and westerlies, but also causes turbulence. Vortices (cyclones and anticyclones) are a natural feature of this kind of turbulent air flow. the Great red spot is an anticyclone, spinning in the counterclockwise direction in Jupiter’s southern hemisphere.
it is more stable than an anticyclone would be on earth because there are fewer disruptions, like land masses, to cause it to break apart. it is also confined by strong winds to not move in latitude, unlike a terrestrial hurricane or cyclone, making it even more stable. in essence it is a
storm rolling like a ball bearing in a moving channel of winds.
Amy Simon is a senior scientist specialising in planetary atmosphere for NASA
the Great red spot has been observed continuously since 1830