Flying through a magnetic switchback in the Sun’s magnetic field, the European Space Agency’s Solar Orbiter has collected important new data that could improve our understanding of dangerous space weather.
In a new study published in Nature Astronomy, researchers analyzed Solar Orbiter’s observations of a magnetic-field switchback to better understand the relationship between the solar wind and the Sun’s volatile atmosphere.
While traveling roughly halfway between Earth and the Sun, Solar Orbiter collected data that allowed scientists to trace the origins of a switchback to the solar atmosphere. The findings could provide new insights into the processes governing the Sun’s magnetic field and the development of space weather.
Solar Switchbacks and Space Weather
The Sun’s magnetic field plays a central role in many of the greatest space-weather threats facing our planet. The solar wind carries magnetic fields outward from the Sun, while magnetic field lines in the solar atmosphere twist, break, and reconnect in a dynamic system that influences conditions throughout the solar system.
Because modern society depends heavily on communications and power networks, including satellites operating beyond the protection of Earth’s atmosphere, space weather has become a major concern. Streams of charged particles released by the Sun can disrupt these essential electrical and communications systems.
A magnetic switchback is a sharp, S-shaped bend in the solar wind’s magnetic field that has long interested scientists, who have debated competing theories about its formation and evolution. By passing through one of these structures, Solar Orbiter was able to sample its particles, which researchers subsequently traced back to the solar atmosphere, revealing new details about the Sun’s magnetic activity.
In the 1970s, the Helios 1 and Helios 2 spacecraft made some of the earliest observations of solar magnetic switchbacks. Since then, the origins of these unusual kinks in the magnetic field have remained a subject of debate. In 2022, Solar Orbiter provided an important piece of the puzzle with the first direct observation of a switchback’s predicted S-shaped structure.
Observing “Interchange Reconnection”
Solar Orbiter’s Solar Wind Analyzer instrument sampled plasma within the switchback as the spacecraft passed through it. Analysis revealed a combination of highly charged oxygen and carbon ions consistent with material originating in the Sun’s hot coronal magnetic loops.
The findings support one of the two leading explanations for switchback formation: a process known as interchange reconnection.
Some solar magnetic field lines extend outward into space, while others form closed loops. When open and closed magnetic field lines reconnect, plasma previously confined within the loops can escape into space, potentially generating the switchbacks observed by Solar Orbiter.
However, the data also suggest that a competing explanation, involving waves and turbulence in the solar wind, may play an important role.
“Excitingly, we also see signs of these, but likely only after the switchback heads out into space,” says co-author Stephanie Yardley of Northumbria University, UK. “Once the switchback has left the Sun, waves and turbulence take over and govern how it moves.
“Overall, it seems that both processes – interchange reconnection and waves and turbulence – are involved in how switchbacks form and move through space,” Yardley continued. “Our finding reconciles the two, showing that they simply operate at different stages in a switchback’s lifetime.”
Future Space Weather Monitoring
The researchers’ analysis extended beyond Solar Orbiter data to include images of the Sun’s disk and magnetic field models, yielding a new model for the switchback’s origin. That new model gives scientists a clearer understanding of how the Sun’s atmosphere heats and imprints a signature on solar particles as it pushes them into space.
Understanding how these particles are pushed into space will be important to refining space weather predictions and maintaining the safety of Earth’s essential power and communications networks.
“As humans on Earth – and in space – our lives are entangled with what’s happening on our star. The solar wind ties the Earth to the Sun, and our understanding of its dynamics has key implications for how we keep our planet safe from extreme space weather events,” concluded Daniel Müller, ESA Project Scientist for Solar Orbiter.
“The more we know, the better we can prepare for solar storms to protect our space-based infrastructure and technology,” Miller said.
The paper, “On the Coronal Origin of Magnetic Switchbacks in the Solar Wind,” appeared in Nature Astronomy on October 8, 2026.
Ryan Whalen covers science and technology for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificate in Data Science. He can be contacted at ryan@thedebrief.org, and follow him on Twitter @mdntwvlf.