NASA's Webb and Hubble telescopes have revealed Saturn's atmosphere and rings layer by layer. Auroras, storms, and the hexagonal jet stream were captured in detail.
NASA's two flagship space telescopes, the James Webb Space Telescope and the Hubble Space Telescope, have carried out one of the most comprehensive observations of Saturn ever obtained. These two powerful observational instruments, operating at different wavelengths, studied the gas giant's atmosphere in a complementary manner, providing rich information to scientists.
While Hubble highlights color changes in the planet's clouds, Webb's infrared observations reveal clouds and chemical components at different depths of the atmosphere. This allows researchers to examine Saturn's atmosphere almost layer by layer, making it possible to understand the three-dimensional structure of the planet's atmosphere.
Numerous Storms and Details Captured
In Webb's infrared images, a long-lasting jet stream called the "ribbon wave" is clearly visible in the north-central latitudes. This current is shaped by atmospheric waves that are normally imperceptible. Immediately below it is a small spot, considered to be a remnant of the "Great Spring Storm" that occurred in 2010-2012. In the southern hemisphere, multiple storm systems are clearly discernible in Webb's images. These structures turn Saturn into a natural laboratory for studying atmospheric movements under extreme conditions.
The edges of Saturn's hexagonal jet stream at its north pole are also visible in Hubble and Webb images. Discovered by Voyager in 1981, this structure has remained stable for decades, demonstrating the stability of large-scale atmospheric processes on giant planets. Since Saturn's north pole will remain in darkness for the next 15 years, these high-resolution images will likely be the last high-resolution images of the hexagon until the 2040s.
In Webb's infrared data, the poles appear in gray-green tones. These emissions may originate from high-altitude aerosols or auroras formed by particles interacting with the planet's magnetic field. NASA's telescopes had previously studied auroras on Jupiter, Uranus, and Neptune.
Saturn's iconic rings are observed differently by the two telescopes. In Webb's infrared images, the rings stand out because they are composed of bright water ice. In Hubble's images, the brightness is lower, and the shadows of the rings are visible on the planet. Furthermore, structural features in the B ring and linear formations called "spokes" appear differently depending on the telescopes. The outermost F ring is seen as thin and sharp in Webb, and fainter in Hubble.
Observations Span Decades
Saturn's orbit around the Sun and Earth's position directly affect the angle from which we observe the planet. These images, taken in 2024, cover a period as Saturn progresses from its northern summer towards the 2025 equinox. As the planet's southern hemisphere transitions into spring and then summer in the 2030s, both Hubble and Webb telescopes will have the opportunity to observe this region with increasing clarity.
Hubble's observations, spanning decades, have created a unique data archive for the scientific community by recording changes in Saturn's atmosphere. The OPAL program, in particular, regularly monitors storms and seasonal changes on the planet. The James Webb Space Telescope, on the other hand, offers researchers the opportunity to study Saturn's atmospheric structure and dynamic processes in more detail and comprehensively than ever before.
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