PUNCH Predicts Solar Storm Arrival Within 30 Minutes in First Test

NASA's PUNCH mission demonstrated a major advance in solar storm forecasting by predicting the arrival of a coronal mass ejection to within 30 minutes in a proof-of-concept test. The results were presented on August 4, 2026, at the Committee on Space Research Scientific Meeting and are under review at the journal Space Weather.

Craig DeForest, principal investigator for PUNCH at Southwest Research Institute's Solar System Science and Exploration Division in Boulder, Colorado, called the outcome stunning. He compared the improvement to the leap from steam engines to modern internal combustion engines.

Solar storms from coronal mass ejections can disrupt power grids, satellites, and astronaut safety, making accurate arrival forecasts critical. Previously, scientists could only track these ejections for about one-fifth of their journey from the Sun to Earth, leaving a large gap in observations.

The PUNCH mission, launched in 2025, uses four spacecraft in low Earth orbit to create continuous 3D images of the inner solar system. It captures a new image every four minutes, allowing scientists to track coronal mass ejections nearly all the way to Earth.

In the test, scientists used data from a coronal mass ejection that left the Sun on May 31, 2025. They fed PUNCH images into a computer model that analyzed the ejection's leading edge, speed, and geometry. Twelve hours after the event, the model predicted the storm would reach Earth eight hours later, and that forecast was accurate to within 30 minutes—10 times better than the 5-hour window of current methods. The model also indicated when its estimate stabilized, giving forecasters confidence.

Beyond forecasting, PUNCH's high-resolution images revealed that coronal mass ejections are clumpier than thought and continue evolving across the solar system. The data also helps researchers study plasma behavior in space, with implications for understanding star-forming regions. Southwest Research Institute in San Antonio leads the mission, with operations in Boulder, and NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages it for the Science Mission Directorate in Washington.