JWST solves decades-long mystery about why Saturn appears to change its spin
Why it matters: This breakthrough fundamentally changes our understanding of planetary atmospheric dynamics and auroral systems.
- Northumbria University researchers utilized the JWST to observe Saturn's northern auroral region, collecting unprecedentedly detailed measurements of temperature and particle density.
- NASA's Cassini spacecraft initially observed what appeared to be a changing rotation rate in 2004, puzzling scientists as a planet's spin should remain constant.
- Professor Tom Stallard's 2021 study first proposed that atmospheric winds, not the planet's rotation, were responsible for the misleading auroral signals, setting the stage for the new JWST findings.
- The JWST's ten times more accurate data allowed for the first high-resolution maps of heating and cooling across Saturn's aurora, confirming that localized auroral heating drives the atmospheric winds.
The James Webb Space Telescope (JWST) has finally resolved a decades-long mystery surrounding Saturn's apparent fluctuating spin rate. Researchers at Northumbria University, led by Professor Tom Stallard, used JWST to reveal that the planet's aurora creates a self-sustaining feedback loop of heat and charged particles, driving atmospheric winds that cause the misleading auroral signals previously attributed to a changing rotation.
