Type IV Solar Burst Lasts 19 Days, Shattering 5-Day Record
Updated
Updated · spacedaily.com · May 16
Type IV Solar Burst Lasts 19 Days, Shattering 5-Day Record
2 articles · Updated · spacedaily.com · May 16
A Type IV solar radio burst tracked from Aug. 21 to Sept. 9, 2025 persisted for 19 days, far beyond the usual hours-to-days span and forcing a rethink of how long electrons can survive in coronal magnetic fields.
Three coronal mass ejections from the same solar region appear to have repeatedly re-energized electrons trapped in a helmet streamer, creating what researchers describe as a corotating electron reservoir.
That mechanism suggests the burst was not one isolated flare-up but a stable magnetic structure acting like a long-lived accelerator, blurring the line between a transient eruption and an ongoing solar feature.
NASA’s STEREO pair, Parker Solar Probe, Wind and ESA-NASA Solar Orbiter were needed to follow the source as the Sun rotated, allowing scientists to identify one continuous event rather than separate bursts.
The finding could reshape models of solar and stellar magnetic activity, with implications for interpreting long-lived CME radio signatures on Sun-like stars and for exoplanet habitability studies.
A solar burst defied physics for 19 days. What other fundamental rules about our star are we getting wrong?
Did a 19-day solar storm just rewrite the rules for finding habitable planets around other stars?
Can new AI predict the Sun's record-breaking 'super-bursts' before they threaten Earth's infrastructure?
Record-Breaking 19-Day Solar Radio Burst of 2025: Causes, Consequences, and Scientific Breakthroughs
Overview
In August 2025, the Sun produced a record-breaking 19-day Type IV solar radio burst, the longest ever observed. This rare event happened during a period of high solar activity and was caused by energetic electrons trapped in stable magnetic structures, known as helmet streamers, in the Sun’s corona. These structures were repeatedly energized by coronal mass ejections, which are massive releases of plasma and magnetic fields. The burst’s exceptional duration provided scientists with valuable data to better understand how the Sun’s magnetic fields trap and accelerate particles, helping to improve models of solar eruptions and space weather forecasting.