Scientists working with NASA's PUNCH mission have pulled off something that would have seemed like science fiction just a few years ago: predicting the arrival of a solar eruption at Earth to within 30 minutes. The result comes from an initial proof-of-concept test using continuous imagery captured by the mission's four spacecraft, and the findings were presented at the Committee on Space Research Scientific Meeting while also under review at the journal Space Weather.
PUNCH — short for Polarimeter to Unify the Corona and Heliosphere — launched in 2025 and operates from low Earth orbit, making continuous 3D observations of the inner solar system. That's a meaningful leap from what was possible before. Prior to PUNCH, scientists could only track coronal mass ejections, the massive eruptions of solar material that drive space weather, across about one-fifth of the distance from the Sun to Earth. Everything after that was essentially educated guesswork.
The stakes for getting this right are high. When a coronal mass ejection reaches Earth, it can disrupt power grids, knock out satellites, and pose radiation risks to astronauts. Shaving the uncertainty in arrival predictions from hours down to half an hour gives operators of critical infrastructure far more useful warning time to take protective action.
Craig DeForest, principal investigator for PUNCH at Southwest Research Institute's Solar System Science and Exploration Division in Boulder, Colorado, called the initial result stunning. He compared the forecasting improvement to the leap from a steam engine to a modern internal combustion engine — a significant upgrade in both reliability and precision.
This story is based on an announcement from NASA.
