James Webb Space Telescope Solves Decades-Long Mystery of Saturn's Variable Spin

Key Points

• JWST solved the mystery of Saturn's variable spin rate using NIRSpec instrument
• Auroral heating drives atmospheric winds that generate electrical currents
• Self-sustaining feedback loop connects atmosphere to magnetosphere
• Findings published in Journal of Geophysical Research: Space Physics
• First comprehensive explanation of how atmospheric conditions affect planetary magnetospheres

Full Details

Scientists at Northumbria University have utilized the James Webb Space Telescope to answer one of planetary science's longest-standing questions: why does Saturn appear to spin at different speeds depending on the measurement method? The findings, published in the Journal of Geophysical Research: Space Physics, reveal the complex patterns of heat and electrically charged particles in Saturn's aurora. The research demonstrates for the first time that the entire system is driven by a self-sustaining feedback loop powered by the planet's northern lights. JWST observations reveal that Saturn's aurora actively heats the planet's upper atmosphere, driving winds that generate electrical currents and sustain the aurora. What happens in Saturn's atmosphere directly influences conditions in its surrounding magnetosphere—the vast region of space shaped by the planet's magnetic field—which in turn feeds energy back into the system.