Overview
- The radio emission ran continuously from August 21 to September 9, 2025, setting a new record for Type IV solar radio bursts that previously lasted up to five days.
- Four spacecraft—Solar Orbiter, Parker Solar Probe, Wind, and STEREO—captured the signal in sequence as the Sun rotated, allowing scientists to stitch together near-continuous observations.
- Analysis shows the burst came from energetic electrons trapped inside a large coronal magnetic structure called a helmet streamer, with a new STEREO-based method used to localize the source.
- The team found three coronal mass ejections from the same region that likely refreshed the trapped electrons and sustained the emission, and they observed regular brightening that matches standing oscillations of the magnetic cavity.
- Although the radio waves posed no direct threat to Earth, the study offers a practical diagnostic for space-weather forecasting and could help protect satellites and crewed missions by flagging solar regions that may produce repeated CMEs.