When NASA scientists first picked up a radio burst coming from the Sun in August 2025, the signal initially appeared routine. Solar radio bursts are fairly common and usually fade within hours or, in some cases, a few days.
This event turned out to be anything but ordinary.
Instead of disappearing, the radio burst continued for an astonishing 19 days, setting a new record for this type of solar activity. The previous longest known event lasted only five days, making the newly observed burst far more persistent than scientists expected.
Strange Solar Radio Signal Breaks Previous Records
The event belonged to a category known as Type IV radio bursts. These bursts are produced by groups of energetic electrons trapped within the Sun's powerful magnetic fields. Although the radio waves themselves do not pose a danger to Earth, the same magnetic conditions can also trigger solar eruptions capable of sending harmful particles into space.
