Sun Emits 19-Day Type IV Radio Burst, Shattering 5-Day Record
Updated
Updated · Universe Today · May 27
Sun Emits 19-Day Type IV Radio Burst, Shattering 5-Day Record
4 articles · Updated · Universe Today · May 27
A Type IV solar radio burst that began in August 2025 lasted 19 days—nearly four times the previous 5-day record—making it the longest event of its kind yet observed.
Three coronal mass ejections from the same active region kept feeding a magnetic trap in a helmet streamer, sustaining the burst far beyond the usual few hours to couple-of-days span.
Four spacecraft—STEREO, Parker Solar Probe, Wind and Solar Orbiter—were needed to reconstruct the full event because the Sun's rotation carried the source in and out of each probe's view.
The radio waves themselves were harmless, but the same magnetic environments can launch particle storms that threaten satellites, spacecraft and other infrastructure.
Researchers said identifying why some bursts persist for days or weeks could sharpen space-weather forecasts and improve protection for astronauts and ground-based systems.
How does this record 19-day solar event redefine the threat to our planet's technology?
Could this solar storm discovery change how we search for habitable alien worlds?
Record-Breaking 19-Day Solar Radio Burst of 2025: Unprecedented Insights into Solar Activity and Space Weather
Overview
Between August 21 and September 9, 2025, scientists observed a solar radio burst that lasted an unprecedented 19 days, setting a new record for solar activity. This event, classified as a corotating type IV continuum, drew significant attention because it revealed how electrons become trapped and move within the Sun’s powerful magnetic fields, emitting radio waves over an extended period. The burst’s remarkable duration allowed researchers to study these processes in detail, offering new insights into the Sun’s magnetic environment and challenging existing models of solar dynamics.