Overview
- The Type IV radio burst persisted from August 21 to September 9, 2025, lasting 19 days and breaking the prior five‑day record.
- Researchers maintained near‑continuous coverage by stitching data from Solar Orbiter, Parker Solar Probe, Wind, and STEREO‑A as the Sun rotated.
- A new STEREO‑A–based tracking method let the team pinpoint the source to a large magnetic arc called a helmet streamer in the solar corona.
- Analysis suggests three coronal mass ejections from the same region repeatedly refilled trapped electrons, which kept the radio emission going.
- The findings, published in Astrophysical Journal Letters, flag long‑duration radio bursts as cues of prolonged magnetic unrest that can help operators prepare for particle storms that threaten satellites and astronauts.