Longest Solar Burst Ever Detected Lasted 19 Days 2026

The longest solar burst ever detected lasted nearly three weeks, according to a new study published in The Astrophysical Journal Letters. The event, a type IV solar burst, persisted for 19 days—from August 21 to September 9, 2025—shattering the previous record of five days.

Four spacecraft had to combine their observations to confirm and study the phenomenon. The European Space Agency's Solar Orbiter first spotted the burst, and NASA's Wind and Parker Solar Probe later confirmed it, with STEREO-A adding further support.

What Is a Type IV Solar Burst?

A solar burst occurs when electrons become trapped in the Sun's magnetic field and spiral around its field lines, emitting intense electromagnetic radiation. There are five known types of solar bursts, each with distinct characteristics.

Type IV bursts are particularly notable for their broad bandwidths and long durations. They often signal the presence of large-scale magnetic structures in the solar corona, which can be important for understanding space weather.

How the Record-Breaking Burst Was Detected

The Solar Orbiter, designed to study the Sun's poles, solar wind, and magnetic field from close range, made the initial detection. It had observed many solar bursts before, but never one with these characteristics.

Twelve days later, NASA's Wind and Parker Solar Probe confirmed the finding. A few days after that, STEREO-A provided additional confirmation. The multi-spacecraft approach was crucial for validating such an extraordinary event.

Why This Solar Burst Matters

This record-breaking burst provides new insights into the Sun's magnetic behavior and the processes that drive long-lasting solar emissions. Understanding these events is key to predicting space weather, which can affect satellites, power grids, and astronaut safety.

The 19-day duration suggests that the underlying magnetic structures remained stable for an unusually long time, offering a rare opportunity to study how energy is released and sustained in the solar corona.

• The burst lasted 19 days, far exceeding the previous 5-day record.
• Four spacecraft—Solar Orbiter, Wind, Parker Solar Probe, and STEREO-A—confirmed the event.
• Type IV bursts are characterized by broad bandwidths and long durations.
• Studying such events helps improve space weather forecasting.
• The finding was published in The Astrophysical Journal Letters.

Comparing Solar Burst Types

Solar bursts are classified into five types based on their radio signatures. The table below summarizes the key features of each type, with type IV being the focus of this record-breaking event. The background to this story is set out in Farthest Fast Radio Burst Ever Detected Reveals Early Universe Secrets. A related thread runs through First Radio Waves Detected from an Exoplanet: What It Means. Earlier coverage in What Is a Thermal Burst and Why It Threatens the Mediterranean shows how the argument developed.

What to Watch Next

Researchers will continue to analyze data from this event to better understand the mechanisms behind such long-duration bursts. Future missions, including the recently launched Aditya-L1 and the upcoming PUNCH mission, will provide additional viewpoints. A closer look at the same subject appears in SpaceX Starship Reaches Orbit for the First Time Ever. Anyone following the wider picture can start with NASA's Fire-Detecting Satellite Plagued by Space Junk. The same theme surfaces in Science: latest articles, which takes a different angle.

As the Sun approaches the peak of its current activity cycle, more extreme events are likely. Keeping an eye on space weather forecasts will be important for anyone reliant on satellite technology. Context on how this played out before sits in SMILE Mission Launch: When We'll See Its First Data.