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NASA’s James Webb Space Telescope found a narrow, powerful jet racing above Jupiter’s equator at about 320 miles per hour (515 kilometers per hour). The feature sits roughly 25 miles (40 kilometers) above the planet’s main clouds, is more than 3,000 miles (4,800 kilometers) wide, and was visible because Webb could track fine haze patterns in the lower stratosphere. The observation is a new clue about how Jupiter’s atmospheric layers may interact—not a complete explanation of the planet’s weather.
What Webb actually discovered
Webb’s Near-Infrared Camera (NIRCam) detected a distinct, narrow equatorial jet in Jupiter’s lower stratosphere. NASA reported the result on October 19, 2023, based on observations made during the Jupiter System Early Release Science program.
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The jet is above the main cloud decks rather than in the cloud-top winds that are usually shown in visible-light images. Researchers tracked haze features moving across Webb images and found that the upper atmospheric motion was much more concentrated and intense than expected.
| Measured characteristic | Reported value |
|---|---|
| Approximate speed | 320 miles per hour (515 kilometers per hour) |
| Altitude | About 25 miles (40 kilometers) above the main clouds |
| Width | More than 3,000 miles (4,800 kilometers) |
| Atmospheric layer | Lower stratosphere, above the principal cloud decks |
| Observation date | July 27, 2022 |
The study’s abstract describes a roughly 140-meter-per-second equatorial jet near the 100–200 millibar pressure levels, confined to about three degrees north and south of the equator. NASA’s public summary gives the more accessible rounded speed, altitude and width figures above.
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Why the result surprised researchers
Jupiter is famous for fast atmospheric circulation, but the newly identified motion did not simply match the winds measured at the main cloud layer. At the equator, haze patterns high above the clouds moved differently from features lower down. Existing atmospheric simulations did not reproduce this elevated, sharply focused jet.
Lead author Ricardo Hueso said, “This is something that totally surprised us.” He also explained why the feature had escaped earlier views: “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.”
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In other words, the surprise came from both the physics and the improved visibility. Webb’s near-infrared filters separated atmospheric levels well enough to reveal organized motion where earlier observations often showed only indistinct haze.
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How Webb and Hubble revealed the motion
- Webb observed Jupiter on July 27, 2022. NIRCam imaged the planet in four filters sensitive to different atmospheric altitudes.
- The observing sequence covered one Jupiter day. Images were taken about ten hours apart, allowing scientists to follow haze features as the planet rotated.
- Researchers tracked the features. Their displacement between images provided wind speeds and showed that the equatorial motion was a narrow, intense jet rather than a broad drift.
- Hubble observed Jupiter the following day. Those visible-light observations supplied deeper context about the cloud-level atmosphere and helped distinguish ordinary convective storms from activity associated with the elevated jet.
Feature tracking measures how visible or infrared patterns move; it does not directly sample gas with an instrument lowered into the atmosphere. The reported speed therefore describes the motion of identifiable atmospheric structures at the observed pressure levels.
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What the jet may say about Jupiter’s atmospheric layers
The authors suggest that Jupiter’s stratospheric equatorial oscillations may extend downward far enough to influence the upper troposphere. These oscillations are recurring changes in stratospheric winds and temperatures. If they are linked to the newly observed jet, energy and momentum could be transferred between layers that are often analyzed separately.
That explanation remains provisional. The elevated jet was found in a single observing epoch, and the published analysis does not establish how its speed, width or altitude change over time. The observation is evidence of an unexpected connection, not a settled mechanism.
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Has the jet changed since 2022?
There is no established time series in the reported sources showing that the jet has strengthened, weakened or moved. Leigh Fletcher, a member of the study team, said that if the jet is tied to the oscillating stratospheric pattern, it might vary considerably over the following two to four years. That was a prediction to test with repeat observations, not a confirmed change.
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Why the finding matters for future Jupiter missions
ESA’s Jupiter Icy Moons Explorer (Juice) mission is designed to investigate Jupiter and its major icy moons, including atmospheric temperatures, winds and chemistry. The Webb result may help mission scientists interpret measurements of Jupiter’s atmospheric circulation and decide how upper-atmosphere dynamics connect with cloud-level weather.
Juice has not yet confirmed the jet or its proposed mechanism. Its relevance here is prospective: a better map of Jupiter’s vertical wind structure gives spacecraft observations a more useful atmospheric context.
What this discovery does—and does not—unravel
- Established: A narrow, fast equatorial jet was observed in Jupiter’s lower stratosphere in July 2022.
- Established: NASA reports a speed of about 515 kilometers per hour, an altitude of about 40 kilometers above the clouds and a width exceeding 4,800 kilometers.
- Established: Webb’s near-infrared haze tracking separated motion above the clouds from the familiar cloud-top circulation.
- Suggested, not proven: Stratospheric equatorial oscillations may influence the upper troposphere through this jet.
- Still unknown: The jet’s lifetime, variability and exact driving mechanism.
The Bottom Line
Webb did not solve Jupiter’s atmosphere; it exposed a missing piece. A 2022 observation revealed a 515-kilometer-per-hour jet in the lower stratosphere, showing that Jupiter’s upper hazes can move in a sharply organized way unlike the winds at the main clouds. Repeated observations will determine whether that surprise is a lasting feature, an oscillation-driven phase or a brief atmospheric event.
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