Record-Breaking Solar Radio Burst Discovered
On August 21, 2025, scientists detected an extraordinary solar radio burst that lasted 19 consecutive days. This event became the longest recorded in history, far exceeding the typical duration of hours to days for similar phenomena. The radio emission persisted for nearly three weeks, gradually changing in intensity and structure.
Technical Details
The signal was captured by four NASA and ESA missions: Solar Orbiter, Parker Solar Probe, Wind, and STEREO-A. These spacecraft recorded the burst across different observation windows, enabling a complete analysis. Astronomers classified the event as a Type IV solar radio emission, which occurs when electrons become trapped in massive magnetic loops in the solar corona.
Cause of the Anomalous Duration
Researchers suggest the burst was caused by three sequential coronal mass ejections in the same solar region. These ejections sustained electron acceleration and radio emissions for almost three weeks. The emission source lies within a giant magnetic "hood" structure, from which plasma streams extend into space.
Significance of the Discovery
While radio waves themselves pose no direct threat to Earth, such events often accompany powerful solar activity that can damage satellites and communication systems. This discovery improves space weather forecasting and helps protect space infrastructure.