Credit: Tingyu Gou - - High Resolution Image
New multi-telescope observations show why a powerful blast never became a true mass ejection.
Cambridge, MA (May, 20, 2026) — A team of scientists has recorded one of the most detailed views ever of a failed solar eruption, a powerful blast from the Sun that never broke free.
In March 2024, the Sun produced an intense solar flare from a large, magnetically complex active region. A prominence, or an ejection of relatively cool, dense gas, rose above the Sun’s surface, carried by the Sun’s twisting magnetic fields that can drive material outward as a coronal mass ejection (CME). Instead, the prominence suddenly slowed, halted, and fell back.
“This strong flare should have produced a big eruption,” said lead author Tingyu Gou, astronomer at the Smithsonian Astrophysical Observatory (SAO), part of the Center for Astrophysics | Harvard & Smithsonian. “Instead, we saw that the eruption stalled and collapsed shortly after its initiation.”
Failed eruptions are not a new discovery; astronomers have observed them, but how and why they occur remains largely a mystery. The team took advantage of a rare observing opportunity to help answer these questions, using data from multiple spacecraft viewing the same event from different angles, and at many wavelengths of light.
NASA’s Solar Dynamics Observatory and the Hinode satellite saw the event from near Earth, while the European Space Agency’s (ESA) Solar Orbiter viewed it from the side. Further radio and ultraviolet observations came from ground-based telescopes and NASA’s IRIS mission.
These combined views, often called multi-messenger observations, allowed the team to track both the hot, X-ray–emitting plasma and the cooler prominence material, and to connect what they saw to a map of the Sun’s underlying magnetic field.
They found that the breaking and rejoining of magnetic field lines was happening at more than one site at the same time. Below the rising magnetic structure, a reconnection of swirling magnetic fields helped push the eruption upward, as is usual in solar flares.
Above it, however, a second reconnection process cut into the top of the erupting magnetic structure itself.
“That upper reconnection weakened the forces that were driving the eruption, which helped to shut it down,” explained Katharine Reeves, astronomer at SAO and coauthor on the paper.
At the same time, very strong overlying magnetic fields acted like a magnetic cage. The scientists’ data showed that these outer fields decayed too slowly to allow the eruption to become unstable and escape. So, the combination of erosion from above and confinement from outside ultimately stopped the eruption in its tracks.
The results help explain a long-standing puzzle in stellar astronomy: why we see many flares on other Sun-like stars, but far fewer clear signs of stellar CMEs. If complex magnetic fields frequently cause eruptions to fail, then some stellar CMEs may die close to the star, and therefore remain hidden from our telescopes, the scientists suggest.
“By watching this failed eruption on our own Sun in detail, we gain a window into how flares and eruptions may work throughout the galaxy,” said Gou. “This work can, in turn, help us understand the physical mechanisms of successful eruptions and space weather environments of distant stars and planets.”
Link to paper: Tingyu Gou, Katharine K. Reeves, Peter R. Young, Astrid M. Veronig, Xingyao Chen, Sijie Yu, Bin Chen & Bin Zhuang (2026) Multi-viewpoint observation of a failed prominence eruption on the Sun, Nature
In March 2024, the Sun produced an intense solar flare from a large, magnetically complex active region. A prominence, or an ejection of relatively cool, dense gas, rose above the Sun’s surface, carried by the Sun’s twisting magnetic fields that can drive material outward as a coronal mass ejection (CME). Instead, the prominence suddenly slowed, halted, and fell back.
“This strong flare should have produced a big eruption,” said lead author Tingyu Gou, astronomer at the Smithsonian Astrophysical Observatory (SAO), part of the Center for Astrophysics | Harvard & Smithsonian. “Instead, we saw that the eruption stalled and collapsed shortly after its initiation.”
Failed eruptions are not a new discovery; astronomers have observed them, but how and why they occur remains largely a mystery. The team took advantage of a rare observing opportunity to help answer these questions, using data from multiple spacecraft viewing the same event from different angles, and at many wavelengths of light.
NASA’s Solar Dynamics Observatory and the Hinode satellite saw the event from near Earth, while the European Space Agency’s (ESA) Solar Orbiter viewed it from the side. Further radio and ultraviolet observations came from ground-based telescopes and NASA’s IRIS mission.
These combined views, often called multi-messenger observations, allowed the team to track both the hot, X-ray–emitting plasma and the cooler prominence material, and to connect what they saw to a map of the Sun’s underlying magnetic field.
They found that the breaking and rejoining of magnetic field lines was happening at more than one site at the same time. Below the rising magnetic structure, a reconnection of swirling magnetic fields helped push the eruption upward, as is usual in solar flares.
Above it, however, a second reconnection process cut into the top of the erupting magnetic structure itself.
“That upper reconnection weakened the forces that were driving the eruption, which helped to shut it down,” explained Katharine Reeves, astronomer at SAO and coauthor on the paper.
At the same time, very strong overlying magnetic fields acted like a magnetic cage. The scientists’ data showed that these outer fields decayed too slowly to allow the eruption to become unstable and escape. So, the combination of erosion from above and confinement from outside ultimately stopped the eruption in its tracks.
The results help explain a long-standing puzzle in stellar astronomy: why we see many flares on other Sun-like stars, but far fewer clear signs of stellar CMEs. If complex magnetic fields frequently cause eruptions to fail, then some stellar CMEs may die close to the star, and therefore remain hidden from our telescopes, the scientists suggest.
“By watching this failed eruption on our own Sun in detail, we gain a window into how flares and eruptions may work throughout the galaxy,” said Gou. “This work can, in turn, help us understand the physical mechanisms of successful eruptions and space weather environments of distant stars and planets.”
Link to paper: Tingyu Gou, Katharine K. Reeves, Peter R. Young, Astrid M. Veronig, Xingyao Chen, Sijie Yu, Bin Chen & Bin Zhuang (2026) Multi-viewpoint observation of a failed prominence eruption on the Sun, Nature
