After 30 Years of Mystery, NASA's Webb Telescope Captures Neptune's Aurora for the First Time
The Daily Galaxy • • science
Key Points:
- NASA’s James Webb Space Telescope has, for the first time, captured detailed images of Neptune’s auroras, solving a mystery dating back to the Voyager 2 mission in 1989 and providing new insights into the planet’s atmosphere and magnetic field.
- The auroras on Neptune are unique, occurring at mid-latitudes rather than near the poles due to the planet’s magnetic field being tilted 47 degrees from its rotational axis, a feature confirmed by Webb’s Near-Infrared Spectrograph.
- Webb’s infrared sensitivity allowed scientists to detect the trihydrogen cation (H3+), a key marker of auroral activity previously observed on other gas giants like Jupiter and Saturn.
- Observations revealed that Neptune’s upper atmosphere has cooled significantly over the past 30 years, with temperatures now about half of what Voyager 2 recorded, likely contributing to the auroras’ faintness and previous difficulty in detection.
- Continued monitoring by Webb is expected to deepen understanding of Neptune’s magnetic field and atmospheric dynamics, emphasizing the importance of infrared instruments for future missions to the outer planets.
