Jupiter’s atmosphere heats up around the planet after a solar wind hits it. This changes how scientists think about giant planets. Jupiter’s skies can glow with lights brighter than anything on Earth.
Its polar auroras shine when charged particles crash into its atmosphere. This creates bursts of heat and energy. These events may give clues about how the Sun affects giant gas planets and Earth’s power grids, satellites, and GPS systems.
A new study shows a surprising link between the Sun’s activity and Jupiter’s huge upper atmosphere. Scientists found that bursts of solar wind can slam into Jupiter. This squeezes its magnetic bubble and sends waves of heat across the planet.
Before, these effects were thought to be limited to the poles. But new evidence shows the Sun’s power reaches much farther. High above Jupiter, its upper atmosphere stretches hundreds of kilometers into space.
This layer has a thermosphere made of neutral hydrogen gas and an ionosphere filled with charged particles like electrons and ions. Both parts respond to energy from the planet’s magnetosphere and the Sun. Some of this energy comes from Io, a volcanic moon that spews gas into space.
As this gas escapes and becomes charged by sunlight, it fills Jupiter’s magnetic field with plasma. The planet spins once every 9 hours and 56 minutes, whipping its magnetosphere along with it. This rapid spin creates electric currents between the magnetosphere and the ionosphere.
These currents help form the planet’s famous auroras. At the poles, the auroras heat the upper atmosphere to more than 900 K (about 627°C). In other places, upper atmospheric temperatures are around 700 K (427°C).
Without extra energy sources, temperatures would drop to about 200 K. This 500 K difference has puzzled scientists for decades. In 2017, scientists using the Keck telescope made detailed maps of Jupiter’s upper atmosphere.
Solar wind heats Jupiter’s atmosphere
They found a huge warm zone far from the poles. This zone stretched across nearly half the planet and reached temperatures of 950 K.
This was 200 K hotter than the surrounding areas. No known process could create such heat outside of the auroral zones. Researchers thought this feature had started from the poles and drifted toward the equator.
Doppler measurements showed that this warm region was moving away from the auroral oval at a speed of 620 meters per second. At the same time the Keck telescope saw Jupiter’s heat wave, data from NASA’s Juno spacecraft revealed something remarkable. The planet’s magnetic field, which usually stretches far into space, had been sharply compressed.
Scientists believe this was caused by a solar wind surge—an extra dense and fast stream of particles from the Sun. Dr. James O’Donoghue, lead author of the new study, explained: “We have never captured Jupiter’s response to solar wind before – and the way it changed the planet’s atmosphere was very unexpected.
This is the first time we’ve ever seen something like this on any outer world.”
The solar wind squeezed Jupiter’s magnetic field, forcing more energy into the poles, heating the upper atmosphere, and causing it to expand. The pressure created strong winds that pushed hot gases toward the equator. Because Jupiter is 11 times wider than Earth, this hot region covered a massive area with temperatures soaring past 500°C, much higher than the usual 350°C background.
The new study combined data from Juno, Keck telescope maps, and solar wind models to trace how heat moved across Jupiter’s atmosphere. This provided a clearer picture of when the energy surge hit and how fast the atmosphere responded. The data confirmed that such hits may occur as often as two or three times a month.
Professor Mathew Owens from the University of Reading stated, “Our solar wind model correctly predicted when Jupiter’s atmosphere would be disturbed. This helps us further understand the accuracy of our forecasting systems, which is essential for protecting Earth from dangerous space weather.”
These findings shake up what scientists thought they knew about planetary interactions with the Sun. Jupiter’s response shows that even distant planets can be deeply affected by solar storms.
Earth’s magnetic field also faces solar wind storms that can damage satellites, interrupt GPS signals, and even knock out power systems. By watching what happens on Jupiter, researchers can improve predictions for how such storms might affect Earth. Each time solar wind hits Jupiter, it reveals more about how planets react, how heat moves through atmospheres, and how energy from space changes the worlds in our solar system.
With more missions like Juno and powerful telescopes like Keck, scientists are getting better at tracking these massive energy shifts. This study shows that Jupiter’s upper atmosphere is far more dynamic—and vulnerable—than previously believed.
Image Credits: Photo by Planet Volumes on Unsplash
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