fizzing and popping with light, sometimes varying by the second
On Christmas Day 2023, astronomers turned humanity's most powerful space telescope toward Jupiter and witnessed something the textbooks said should not exist — auroras flickering and reshaping themselves within single seconds, defying decades of carefully constructed atmospheric theory. The James Webb Space Telescope, working in concert with Hubble, revealed that the brightest infrared light dancing above Jupiter's poles had almost no ultraviolet counterpart, a contradiction that points toward unknown particle physics deep within the planet's magnetosphere. What began as a holiday observation has become a reminder that even the most familiar giants of our solar system still hold secrets capable of humbling our best science.
- Auroras on Jupiter were expected to shift gradually over fifteen minutes — instead, JWST watched them fizz and pop with light that changed within a single second, shattering the existing timeline of how these phenomena behave.
- When infrared data from Webb was laid beside simultaneous ultraviolet images from Hubble, the two pictures refused to align — the brightest infrared signals had almost no ultraviolet echo, a mismatch that current models cannot explain.
- To account for what both telescopes recorded simultaneously, Jupiter's atmosphere would need to be flooded with enormous quantities of very low-energy particles — a scenario that the same models declare physically impossible.
- Scientists have pinned down that the trihydrogen cation molecule survives roughly two and a half minutes in Jupiter's atmosphere, a first precise measurement, but this finding only deepens the puzzle rather than resolving it.
- The discovery is now pushing researchers toward entirely new theoretical frameworks — ones that may ultimately reshape our understanding of auroral mechanics not just on Jupiter, but across gas giants throughout the cosmos.
On Christmas Day 2023, astronomers aimed the James Webb Space Telescope at Jupiter and watched its auroras behave in ways that contradicted everything scientists thought they knew. Rather than fading and brightening gradually over roughly fifteen minutes, the auroral display was "fizzing and popping with light," shifting dramatically — sometimes within a single second. "What a Christmas present it was," said Jonathan Nichols of the University of Leicester, who led the research. "It just blew me away."
Jupiter's auroras are born from charged particles — streaming from the sun and from volcanic eruptions on the moon Io — that are funneled by the planet's enormous magnetic field toward its poles, where they slam into hydrogen in the upper atmosphere and produce a glow hundreds of times brighter than Earth's Northern Lights. Nichols and his team were specifically tracking a molecule called trihydrogen cation, or H₃⁺, which forms during these collisions and radiates heat away from the planet. For the first time, they were able to measure precisely how long the molecule survives: about two and a half minutes before fast-moving electrons destroy it — a measurement ground-based telescopes had never been sensitive enough to achieve.
The deeper mystery surfaced when the team compared JWST's infrared observations with simultaneous ultraviolet images from the Hubble Space Telescope. The two instruments were watching the same auroras across different parts of the electromagnetic spectrum, and what they found made no sense: the brightest infrared signals Webb detected had almost no counterpart in Hubble's ultraviolet data. The two pictures simply did not match.
For both sets of observations to be true simultaneously, Jupiter's atmosphere would need to be struck by vast quantities of very low-energy particles — something current models of the planet's magnetosphere consider impossible. "We still don't understand how this happens," Nichols acknowledged. The discovery suggests that either the models governing how particles move through Jupiter's magnetosphere need fundamental revision, or the physics of how those particles interact with atmospheric gases is far more complex than anyone had imagined. The implications reach beyond Jupiter: cracking this puzzle could sharpen our understanding of auroral mechanics on distant exoplanets and refine how scientists model planetary atmospheres across the solar system.
On Christmas Day 2023, astronomers pointed the James Webb Space Telescope at Jupiter and watched its auroras flicker and dance in ways that shouldn't be possible. What they saw—rapid pulses of light changing by the second, brightness patterns that contradicted decades of atmospheric theory—has left them genuinely puzzled.
Jupiter's auroras are born from a violent collision of particles and gas. The planet's enormous magnetic field traps charged particles streaming from the sun and from eruptions on its volcanic moon Io, funneling them toward the poles at tremendous speed. When these high-energy electrons slam into hydrogen in the upper atmosphere, they trigger a glow hundreds of times brighter than Earth's Northern Lights. Scientists have studied this phenomenon for years, but they thought they understood its rhythms: auroras should fade and brighten gradually, over the course of perhaps fifteen minutes.
What Jonathan Nichols and his team at the University of Leicester observed instead was something far more volatile. Using JWST's infrared cameras, they watched Jupiter's auroral region "fizzing and popping with light," as Nichols described it—the whole display shifting and changing sometimes within a single second. "What a Christmas present it was," he said. "It just blew me away." The researchers were specifically tracking the infrared emissions from a molecule called trihydrogen cation, or H₃⁺, which forms when energetic electrons collide with hydrogen atoms. This molecule is crucial because it radiates heat away from Jupiter's atmosphere, helping regulate the planet's temperature. By measuring how quickly H₃⁺ appears and disappears, the team could begin to understand how much cooling effect it actually provides. They found that the molecule persists for about two and a half minutes before being destroyed by fast-moving electrons—a measurement that ground-based telescopes had never been sensitive enough to pin down before.
But the real mystery emerged when Nichols and his colleagues compared JWST's infrared observations with simultaneous ultraviolet images captured by the Hubble Space Telescope. The two instruments were looking at the same auroras from different angles of the electromagnetic spectrum. What they found made no sense: the brightest infrared light that Webb detected had almost no counterpart in Hubble's ultraviolet pictures. The two datasets simply didn't match.
To produce the combination of brightness patterns both telescopes recorded, the atmosphere would need to be bombarded by enormous quantities of very low-energy particles—a scenario that current models of Jupiter's magnetosphere say is impossible. "We need to have a combination of high quantities of very low-energy particles hitting the atmosphere, which was previously thought to be impossible," Nichols said. "We still don't understand how this happens." The discovery suggests that something fundamental about how particles interact with Jupiter's upper atmosphere remains unknown. Either the models of how particles are accelerated and transported through the magnetosphere need revision, or the physics of how those particles interact with atmospheric gases is more complex than anyone realized. The answer matters beyond Jupiter: understanding how auroras work on gas giants could illuminate the mechanisms that drive similar phenomena on exoplanets and help refine our models of planetary atmospheres across the solar system.
Citas Notables
The whole auroral region was fizzing and popping with light, sometimes varying by the second, rather than fading gradually over a quarter hour as expected.— Jonathan Nichols, University of Leicester
The brightest light observed by Webb had no real counterpart in Hubble's pictures, leaving scientists scratching their heads about how such brightness combinations could occur.— Jonathan Nichols, University of Leicester
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that auroras change by the second instead of over fifteen minutes?
Because the speed of change tells you something about the energy being pumped into the atmosphere. If auroras fade slowly, you're dealing with a steady, predictable process. But if they're flickering and popping, it means the particle streams hitting the atmosphere are much more variable and chaotic than we thought. That changes how we calculate energy transfer.
And the H₃⁺ molecule—why focus on that specifically?
It's a thermometer and a messenger both. When it forms, it radiates heat. When it gets destroyed, that tells you something about the electron density. By measuring how long it survives, you can work backward to understand the whole energy budget of the aurora.
So what's actually impossible about what they found?
The brightness pattern suggests low-energy particles are flooding the atmosphere in quantities that shouldn't exist. Current theory says those particles should be stripped away or deflected by the magnetosphere before they ever reach the upper atmosphere. But the data says they're there.
Could the instruments be wrong?
Unlikely. Webb and Hubble are among the most reliable observatories we have. The problem is that they're seeing something real that our models didn't predict. That's actually exciting—it means there's a gap in our understanding.
What happens next?
More observations, probably. And theorists will need to rethink how particles move through Jupiter's magnetosphere. The answer might change how we understand auroras on other planets too.