Astronomy
Properties of Jupiter's Great Red Spot Storm
Quick fact
The Great Red Spot is about 1.3 times the diameter of Earth and has wind speeds exceeding 400 miles per hour (640 km/h) at its edges.
Why this is interesting
Imagine a storm larger than Earth, raging for centuries without weakening—that's Jupiter's Great Red Spot. What makes this swirling crimson vortex so incredibly stable?
Read the full explanation
Understanding Properties of Jupiter's Great Red Spot Storm
Jupiter's Great Red Spot is a colossal, high-pressure storm in the planet's southern hemisphere, similar to a hurricane but much larger. It rotates counterclockwise (anti-cyclonic) and is driven by Jupiter's rapid rotation (a day under 10 hours). The storm's distinct red colour likely comes from chemical reactions in Jupiter's clouds, possibly involving sulfur, phosphorus, or organic compounds. The spot has been observed for over 350 years, shrinking slightly in recent decades but remaining remarkably persistent.
A deeper explanation
The Great Red Spot's longevity results from a combination of factors. Jupiter lacks a solid surface, so the storm isn't dissipated by land friction. The planet's fast rotation creates strong Coriolis forces that help maintain the storm's structure. Additionally, the spot is embedded in a high-speed east-west jet stream, which acts like a protective barrier, preventing it from being torn apart by surrounding turbulence. Recent observations suggest the storm gets energy from descending gases that warm its core, creating a self-sustaining cycle. Understanding these properties helps scientists model atmospheric dynamics on other planets and even improve our knowledge of extreme weather patterns on Earth.