Great Red Spot
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| Name | Great Red Spot |
| Caption | The Great Red Spot as imaged by Voyager 1 in 1979. |
| Type | Persistent anticyclonic storm |
| Location | Jupiter's southern hemisphere |
| Coordinates | 22°S |
| Diameter | ~16,350 km (as of 2017) |
Great Red Spot. It is a persistent high-pressure region and anticyclonic storm in the atmosphere of Jupiter, located 22 degrees south of the planet's equator. The spot is the largest known vortex in the Solar System, having been continuously observed since 1831, with possible sightings dating back to the 17th century. Its striking reddish hue and immense size, which has varied significantly over centuries, make it one of the most iconic features of the gas giant.
Overview
The Great Red Spot is embedded within one of the prominent banded cloud structures, specifically the South Equatorial Belt, of Jupiter. This colossal storm rotates counterclockwise, completing a full revolution approximately every six Earth days, which classifies it as an anticyclone in the planet's southern hemisphere. Observations from missions like Voyager 1, Voyager 2, and the Hubble Space Telescope have shown that the spot is not a surface feature but exists within the upper layers of the atmosphere of Jupiter. Its longevity and stability, despite the turbulent environment, present a major puzzle in planetary science and fluid dynamics.
Physical characteristics
The Great Red Spot is characterized by its enormous scale and distinct coloration. Measurements from the Galileo probe and Hubble Space Telescope indicate its size has been shrinking, with its longitudinal diameter reducing from about 40,000 km in the 19th century to roughly 16,000 km in recent decades. The storm towers above the surrounding clouds, with its cloud tops being several kilometers higher and colder, as detected by instruments on the Juno mission. The exact chemistry behind its reddish orange color remains uncertain but is hypothesized to involve complex organic compounds, perhaps phosphorus or sulfur-containing molecules, brought up from deeper atmospheric layers by the storm's upwelling.
Observation history
The first certain observation of the Great Red Spot is attributed to astronomer Heinrich Schwabe in 1831, though possible earlier descriptions exist from Giovanni Cassini in 1665. It was sketched in detail by observers like William R. Dawes and became a permanent subject of study following its clear depiction by C. W. Pritchett in 1878. Continuous monitoring began in earnest in the late 19th century by institutions like the Royal Greenwich Observatory. The modern era of close observation was inaugurated by the Pioneer 10 and Pioneer 11 flybys in the 1970s, followed by the detailed imagery returned by the Voyager program, which revealed its complex internal cloud structures.
Dynamics and longevity
The storm's persistence is believed to be powered by the absorption of smaller vortices and the transfer of energy from the intense jet streams that flank it, particularly the strong eastward and westward zonal flows of the South Equatorial Belt. Unlike terrestrial hurricanes, which derive energy from warm ocean waters, the Great Red Spot is a free vortex sustained by Jupiter's internal heat and the dynamics of its deep atmosphere. Theoretical models, including those developed at the Massachusetts Institute of Technology and the University of California, Berkeley, suggest its stability is related to its vertical structure, potentially extending dozens of kilometers into the planet's interior, as supported by gravity data from Juno.
Related atmospheric phenomena
Jupiter's atmosphere hosts numerous other vortices and turbulent features. Notable examples include the long-lived White Oval storms, such as those observed by Voyager 1, and the more recent formation of a third red spot, dubbed Oval BA or "Red Spot Jr.", which intensified in color in 2006. The planet's banded appearance is defined by alternating eastward and westward jet streams, with phenomena like the North Equatorial Belt and the South Temperate Belt exhibiting their own complex storm activity. Studies of these features, often conducted using the Hubble Space Telescope and the Keck Observatory, provide comparative context for understanding the unique mechanics and chemistry of the Great Red Spot.