Four different spacecraft have confirmed the detection of the longest solar burst ever measured. Previously, the longest known solar burst lasted only five days. However, this new solar event, detailed in a study published in The Astrophysical Journal Letters<\/em>, stretched from August 21 to September 9, 2025, lasting an impressive 19 days.<\/p>\n This remarkable solar burst was first detected by the Solar Orbiter, a European Space Agency (ESA) spacecraft designed to study the Sun’s poles, solar winds, and magnetic field from a close range. While the Solar Orbiter had previously encountered solar bursts, none exhibited characteristics like this one.<\/p>\n Twelve days later, NASA’s Wind and Parker Solar Probe confirmed the detection of this extraordinary event. Shortly after, the Solar Terrestrial Relations Observatory (STEREO-A) also lent its support, further validating the findings.<\/p>\n<\/p>\n This extended solar burst is classified as a type IV burst, a phenomenon that occurs when electrons become trapped in the Sun’s magnetic field, spiraling along its lines and generating substantial electromagnetic radiation. Among the five different types of solar bursts, type IV bursts are known for their wide bandwidths and can last for hours. The unprecedented duration of this particular burst has garnered significant attention from the scientific community.<\/p>\n Solar flares themselves pose no harm to Earth, as they only emit radio waves, unlike solar winds or coronal mass ejections, which release charged particles. However, this recent burst appears to be linked to coronal mass ejections (CMEs). Insights gathered by STEREO-A suggest that three CMEs acted as a “food source” for the prolonged radio burst.<\/p>\n Coronal mass ejections are sudden releases of plasma from the solar corona, occurring when large energy accumulations take place. In this case, these CMEs likely supplied electrons to sustain the burst for an extended period. As the burst began to wane, it appeared that the Sun continued to provide the necessary “food” to maintain the phenomenon.<\/p>\n Discoveries like these are vital for enhancing our understanding of solar dynamics. The Sun operates on approximately 11-year cycles of activity, marked by peaks of solar activity followed by lulls. The year 2025 was particularly active, making it imperative to study the events of that time. Insights gained from analyzing such phenomena can be crucial, particularly concerning solar winds or coronal mass ejections that may impact telecommunications on Earth. <\/p>\n Much like paleontologists studying dinosaur footprints, analyzing the remnants left by this long solar burst offers insights into the complexities of solar activity and its impacts on our planet.<\/p>\nFour Ships, One Discovery<\/h3>\n
Understanding Type IV Bursts<\/h3>\n
The Role of Coronal Mass Ejections<\/h3>\n
What Are Coronal Mass Ejections?<\/h4>\n
The Importance of Findings<\/h3>\n