NASA’s PREFIRE satellites record two years of polar heat

NASA’s PREFIRE satellites have completed two full seasonal cycles over the Arctic and Antarctic. The twin CubeSats began collecting science data in July 2024 and now show how surface temperature and outgoing heat change through opposite polar seasons.

The important part is the wavelength. Nearly 60% of the energy Earth loses to space leaves as far-infrared radiation, according to NASA, yet that portion had not been measured comprehensively at global scale.

PREFIRE turns that invisible flow into direct observations. One instrument system can follow the Arctic’s broad summer thaw and Antarctica’s much colder swing, giving scientists a comparable record across both poles.

Climate models previously had to estimate this part of the energy budget with less direct coverage. Researchers can now test whether the models reproduce the seasonal patterns and see where clouds, ice or the atmosphere are handled poorly.

Two years of data do not settle every question about polar change or guarantee a better forecast. The advance is simpler: a large invisible part of Earth’s heat loss is now measurable.

Better observations expose where a model is guessing

A model can produce a plausible total while still representing clouds, ice or atmospheric moisture imperfectly. Direct far-infrared observations give researchers a new comparison point for those components across changing seasons. Agreement increases confidence in the physical treatment; disagreement identifies where the model needs work. The measurements do not replace the model or forecast the future on their own. Their value is that an important part of the polar energy budget no longer has to be constrained with the same observational gap.