What if the best information to predict tomorrow’s storms came in wavelengths higher than human vision?
NASA’s PREFIRE mission Polar Radiant Energy in the Far-InfraRed Experiment is now delivering that very capability, using two shoebox-sized CubeSats with spectrometers capable of sensing far-infrared light with unprecedented resolution. Recently extended to September 2026, the mission is shifting from a northern-hemisphere concentration on the Arctic and Antarctic towards a genuinely global focus, with the intent to transform how scientists model moisture circulation, storm development, and the world’s heat balance.
At the heart of PREFIRE are advanced far-infrared spectrometers developed at NASA’s Jet Propulsion Laboratory. These instruments can sense 10 times more far-infrared wavelengths than any comparable device, enabling detection of subtle differences in thermal radiation that conventional sensors miss. “The PREFIRE satellites show that at these longer wavelengths, the amount of radiation going into space can differ from one type of ice to another by as much as 5%,” explained JPL project scientist Brian Drouin. “Measurements that look at the same areas but with shorter wavelengths do not show this difference.” The sensitivity is significant because far-infrared radiation accounts for as much as 60 percent of polar heat emissions, yet has never been measured systematically before from space.
The initial polar emphasis of the mission originated from the impact of the high-latitude areas on Earth’s climate. Heat acquired in the tropics is transported poleward in the form of winds, storms, and ocean currents, and there emitted to space much of it as far-infrared radiation by ice, snow, and clouds. Heat loss in the poles balances the global energy budget and influences weather everywhere. By its expansion to worldwide coverage, PREFIRE will then examine similar processes in mid- and low-latitude systems and how energy exchange between the Earth and space is affected by the size and make-up of ice particles in clouds.
The two CubeSats are in asynchronous near-polar orbits, intersecting the same points hours apart. This configuration allows them to capture short-term changes such as the rapid formation or dissipation of cloud cover and quantify their impact on surface temperatures. As principal investigator Tristan L’Ecuyer of the University of Wisconsin–Madison explained, “We’ll be able to incorporate the data into weather prediction models to improve forecasts and improve our understanding of how moisture circulates, which affects where storms form and how precipitation moves around the world.”
The technology of PREFIRE’s miniature platforms is founded on the development of CubeSat technology for high-resolution Earth observation. Although earlier climate-focused CubeSats such as the 3U MeznSat shortwave infrared spectrometer demonstrated the promise of miniaturized payloads, PREFIRE’s design extends the limits of thermal infrared sensing in a nanosatellite package. Its spectrometers, conceptually similar to the Offner-based Thermal IR Spectrometer (TIRS) used for lunar mineral mapping, are optimized for the 15–100 micron range wavelengths very sensitive to the microphysical properties of ice clouds, e.g., size and shape of crystals.
Far-infrared remote sensing has historically been restrained by detector and optic technology, illustrated in Antarctic field campaigns with REFIR-PAD class instruments. Such ground measurements proved that accurate retrieval of far-infrared wavelength cloud optical thickness and particle size is applicable in reducing general circulation model errors. PREFIRE now extends these capabilities to global, space-based observation with persistent data sets available for direct assimilation into climate and weather models.
PREFIRE data are processed at the University of Wisconsin–Madison, where researchers feed them into simulations that also include atmospheric water vapor profiles, cloud phase, and surface emissivity. This integration is expected to make predictions not only of storm tracks and intensity but also long-term climate events such as glacier melting rates and sea-level rise more accurate. The budget-cutting approach of the mission capitalizing on commercial launch capabilities from Rocket Lab and small, high-performance satellite buses from Blue Canyon Technologies is part of a broader movement toward focused, specialized missions for Earth science in support of larger observatories.
By revealing otherwise hidden streams of far-infrared energy that drive weather and climate, PREFIRE is poised to complete one of the longest-running gaps in atmospheric science. For meteorologists and climate modelers, the mission’s significantly expanded global dataset could mean more accurate forecasts, better forecasting of extreme weather threats, and a better understanding of how a warming world redistributes its heat.
