The predictive model forecasted Earth arrival for a coronal mass ejection with an accuracy of within about 30 minutes, eight hours after the start of the observational data, marking a significant improvement.

In a May 31, 2025 proof-of-concept test, the model determined Earth arrival within 30 minutes, eight hours post-ejection, representing roughly ten times greater accuracy than the prior five-hour window.

The PUNCH mission is led by the Southwest Research Institute, operated from Boulder, Colorado, with NASA Goddard Space Flight Center overseeing mission operations for the Space Science Mission Directorate.

Beyond forecasting, high-resolution PUNCH images reveal evolving, clumpier CME structures that continue to develop as they traverse space, enhancing understanding of CME dynamics and solar plasma behavior.

The results signify an order-of-magnitude improvement over current forecasting methods and could transform space weather prediction for power grids, satellites, and astronauts.

NASA's PUNCH mission, launched in March 2025, uses a constellation of four microsatellites to monitor the sun continuously and capture CMEs in detail.

PUNCH provides continuous 3D imaging of the inner solar system, enabling near-Earth storm forecasting with unprecedented lead time and accuracy.

The initial proof-of-concept is described in a paper under review for Space Weather, with optimism that refined data and models could extend forecast lead times.

This performance vastly exceeds previous methods, which had about a five-hour error margin and could track only roughly one-fifth of a CME’s journey before PUNCH.

Accurate solar storm forecasts can mitigate impacts on geomagnetic systems, satellites, communications, power grids, and internet connectivity by enabling better preparedness.

The test used four PUNCH spacecraft in low Earth orbit to capture images every four minutes, enabling near-continuous tracking of CMEs from the Sun to Earth.

PUNCH provides imagery about every four minutes, supporting full tracking of CMEs from the Sun to Earth rather than partial monitoring.