https://phys.org/news/2018-11-rich-variety-meteorological-phenomena-jupiter.html

"These phenomena are confined to a thin layer only 50 km thick, which represents the roof of the clouds of the spot, while inside, the spot probably goes down to a depth of a couple of hundred kilometres," say the researchers. They used the images taken by the JunoCam during its close flyby across the Great Red Spot. These and other aspects of this phenomenon are the focus of the research that the Juno mission will be conducting over the next few years.

The Great Red Spot, observed for the first time with certainty 150 years ago, shows up through the telescope owing to its reddish colour against the white, yellowish, ochre clouds contrasting with the rest of the planet. Despite the numerous studies conducted on the storm, its nature poses a huge challenge for planetary meteorologists.