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Webb discovers new feature in Jupiter's atmosphere

Webb Discovers New Feature in Jupiter’s Atmosphere
Researchers using NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) have discovered a high-speed jet stream sitting over Jupiter’s equator, above the main cloud decks. At a wavelength of 2.12 microns, which observes between altitudes of about 12-21 miles (20-35 kilometers) above Jupiter’s cloud tops, researchers spotted several wind shears, or areas where wind speeds change with height or with distance, which enabled them to track the jet. This image highlights several of the features around Jupiter’s equatorial zone that, between one rotation of the planet (10 hours), are very clearly disturbed by the motion of the jet stream. Credit: NASA, ESA, CSA, STScI, Ricardo Hueso (UPV), Imke de Pater (UC Berkeley), Thierry Fouchet (Observatory of Paris), Leigh Fletcher (University of Leicester), Michael H. Wong (UC Berkeley), Joseph DePasquale (STScI)

Jupiter has some of the most conspicuous atmospheric features in our solar system. The planet’s Great Red Spot, large enough to envelop Earth, is nearly as well known as some of the various rivers and mountains on the planet we call home.


However, much like Earth, Jupiter is ever-changing, and there’s much about the planet we have yet to learn. NASA’s James Webb Space Telescope is unlocking some of those mysteries, revealing new features of Jupiter we’ve never seen before, including a high-speed jet speeding over the planet’s equator.

While the jet stream is not as visually apparent or stunning as some of Jupiter’s other features, it’s giving researchers incredible insight into how the layers of the planet’s interact with each other, and how Webb will aid in these investigations in the future.

NASA’s James Webb Space Telescope has discovered a new, never-before-seen feature in Jupiter’s atmosphere. The high-speed jet stream, which spans more than 3,000 miles (4,800 kilometers) wide, sits over Jupiter’s equator above the main cloud decks. The discovery of this jet is giving insights into how the layers of Jupiter’s famously turbulent atmosphere interact with each other, and how Webb is uniquely capable of tracking those features.

“This is something that totally surprised us,” said Ricardo Hueso of the University of the Basque Country in Bilbao, Spain, lead author on the paper describing the findings. “What we have always seen as blurred hazes in Jupiter’s atmosphere now appear as crisp features that we can track along with the planet’s fast rotation.”

The research team analyzed data from Webb’s NIRCam (Near-Infrared Camera) captured in July 2022. The Early Release Science program—jointly led by Imke de Pater from the University of California, Berkeley and Thierry Fouchet from the Observatory of Paris—was designed to take images of Jupiter 10 hours apart, or one Jupiter day, in four different filters, each uniquely able to detect changes in small features at different altitudes of Jupiter’s atmosphere.

“Even though various ground-based telescopes, spacecraft like NASA’s Juno and Cassini, and NASA’s Hubble Space Telescope have observed the Jovian system’s changing , Webb has already provided new findings on Jupiter’s rings, satellites, and its atmosphere,” de Pater noted.

While Jupiter is different from Earth in many ways—Jupiter is a gas giant, Earth is a rocky, temperate world—both planets have layered atmospheres. Infrared, visible, radio, and ultraviolet-light wavelengths observed by these other missions detect the lower, deeper layers of the planet’s atmosphere—where gigantic storms and ammonia ice clouds reside.

Webb discovers new feature in Jupiter's atmosphere
Astronomers using NASA’s James Webb Space Telescope have discovered a high-speed jet stream traveling over Jupiter’s equator above the main cloud decks. The jet is traveling 320 miles per hour (515 kilometers per hour). It is located around 25 miles (40 kilometers) in altitude, in Jupiter’s lower stratosphere, just above the tropospheric hazes next to the boundary between the layers. Jupiter has a layered atmosphere, and this illustration displays how Webb is uniquely capable of collecting information from higher layers of the altitude than before. Scientists were able to use Webb to identify wind speeds at different layers of Jupiter’s atmosphere in order to isolate the high-speed jet. The observations of Jupiter were taken 10 hours apart, or one Jupiter day, in three different filters, noted here, each uniquely able to detect changes in small features at different altitudes of Jupiter’s atmosphere. Credit: NASA, ESA, CSA, STScI, Ricardo Hueso (UPV), Imke de Pater (UC Berkeley), Thierry Fouchet (Observatory of Paris), Leigh Fletcher (University of Leicester), Michael H. Wong (UC Berkeley), Illustration: Andi James (STScI)

On the other hand, Webb’s look farther into the than before is sensitive to the higher-altitude layers of the atmosphere, around 15-30 miles (25-50 kilometers) above Jupiter’s cloud tops. In near-infrared imaging, high-altitude hazes typically appear blurry, with enhanced brightness over the equatorial region. With Webb, finer details are resolved within the bright, hazy band.

The newly discovered jet stream travels at about 320 miles per hour (515 kilometers per hour), twice the sustained winds of a Category 5 hurricane here on Earth. It is located around 25 miles (40 kilometers) above the clouds, in Jupiter’s lower stratosphere.

By comparing the winds observed by Webb at high altitudes, to the winds observed at deeper layers from Hubble, the team could measure how fast the winds change with altitude and generate wind shears.

While Webb’s exquisite resolution and wavelength coverage allowed for the detection of small cloud features used to track the jet, the complementary observations from Hubble taken one day after the Webb observations were also crucial to determine the base state of Jupiter’s equatorial atmosphere and observe the development of convective storms in Jupiter’s equator not connected to the jet.

“We knew the different wavelengths of Webb and Hubble would reveal the three-dimensional structure of storm clouds, but we were also able to use the timing of the data to see how rapidly storms develop,” added team member Michael Wong of the University of California, Berkeley, who led the associated Hubble observations.

The researchers are looking forward to additional observations of Jupiter with Webb to determine if the jet’s speed and altitude change over time.

“Jupiter has a complicated but repeatable pattern of winds and temperatures in its equatorial stratosphere, high above the winds in the clouds and hazes measured at these wavelengths,” explained team member Leigh Fletcher of the University of Leicester in the United Kingdom. “If the strength of this new jet is connected to this oscillating stratospheric pattern, we might expect the jet to vary considerably over the next 2 to 4 years—it’ll be really exciting to test this theory in the years to come.”

“It’s amazing to me that, after years of tracking Jupiter’s clouds and winds from numerous observatories, we still have more to learn about Jupiter, and features like this jet can remain hidden from view until these new NIRCam images were taken in 2022,” continued Fletcher.

The researchers’ results were recently published in Nature Astronomy.

More information:
Hueso, R. et al. An intense narrow equatorial jet in Jupiter’s lower stratosphere observed by JWST, Nature Astronomy (2023). DOI: 10.1038/s41550-023-02099-2. www.nature.com/articles/s41550-023-02099-2

Citation:
Webb discovers new feature in Jupiter’s atmosphere (2023, October 19)
retrieved 21 October 2023
from https://phys.org/news/2023-10-webb-feature-jupiter-atmosphere.html

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