Jupiter's Great Red Spot: A 300-year-old cyclone persists but is shrinking

phys.org | 3/19/2019 | Staff
CarisCaris (Posted by) Level 3
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The Great Red Spot, a storm larger than the Earth and powerful enough to tear apart smaller storms that get drawn into it, is one of the most recognizable features in Jupiter's atmosphere and the entire solar system. The counterclockwise-moving storm, an anticyclone, boasts wind speeds as high as 300 miles per hour. This prominent feature, observed since 1830, and possibly as far back as the 1660s, has long been a source of great fascination and scientific study.

Much about the Great Red Spot is still unknown, including exactly when and how it formed, what gives it its striking red color and why it has persisted for so much longer than other storms that have been observed in the atmosphere of Jupiter. However, astronomers think that its position in latitude, consistently observed to be 22 degrees south of Jupiter's equator, is connected to the prominent cloud bands in Jupiter's atmosphere.

Astronomer - Studies - Atmospheres - Comets - Storms

As a planetary astronomer who studies the atmospheres of comets, I'm normally not investigating massive storms. But I still want to know about the features seen in the atmosphere of other bodies in the solar system, including Jupiter. Studying atmospheres of all kinds deepens our understanding of how they form and work.

Unlike Jupiter, the Earth has land masses that cause major storms to lose energy due to friction with a solid surface. Without this feature, Jupiter's storms are more long-lasting. However, the Great Red Spot is long-lived, even by Jupiter standards. Researchers don't quite understand why, but we do know that Jupiter's storms that are located in cloud bands with the same direction of rotation tend to be longer lasting.

Alternating - Bands - Belts - Bands - Zones

These colorful alternating bands, called belts (dark bands) and zones (light bands), run parallel to Jupiter's equator. Researchers aren't sure what causes the coloration of the bands and zones, but differences in their...
(Excerpt) Read more at: phys.org
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