PREFIRE mission

Why in News
•  NASA has extended the PREFIRE mission till September 2026 and expanded its scope from polar regions to global observations. 
Polar Radiant Energy in the Far-InfraRed Experiment (PREFIRE) Mission
•  The PREFIRE mission studies Earth’s energy balance, particularly the heat radiated into space from polar regions. 
•  It focuses on far-infrared (FIR) radiation, a critical but under-measured component of Earth’s outgoing heat. 
•  Earth absorbs most solar energy in the tropics, which is redistributed to the poles through atmospheric and oceanic circulation. 
•  The polar regions release this excess heat into space, helping regulate global climate systems. 
Features of the Mission
•  The mission uses two CubeSats equipped with Thermal Infrared Spectrometers (TIRS). 
•  It was launched in 2024 with an initial duration of 10 months. 
•  The satellites operate in near-polar orbits, enabling frequent observations of Arctic and Antarctic regions. 
•  It measures the role of water vapour, clouds, ice, and snow in heat retention and radiation. 
•  The mission has now expanded to global coverage, improving climate system understanding. 
•  Data can be integrated with missions like GRACE mission for enhanced insights. 
Key Data 
•  Far-infrared radiation lies in the 15–100 micrometre wavelength range. 
•  Nearly 60% of Arctic heat emission occurs at wavelengths above 15 micrometres. 
•  PREFIRE sensors measure radiation across the 5–54 micrometre spectrum. 
Challenges
•  Far-infrared radiation has been poorly measured globally, especially in polar regions. 
•  Climate models face uncertainty in estimating heat loss and energy balance. 
•  Experts suggest that limited FIR data restricts accurate prediction of extreme weather and climate change impacts. 
Applications
•  The mission improves understanding of Earth’s radiation budget and energy balance. 
•  It enhances predictions of weather severity, storm frequency, and climate change trends. 
•  The data supports analysis of sea ice dynamics, permafrost changes, and polar warming. 
•  Improved FIR data leads to more reliable climate models and projections. 
Way Forward
•  Expanding FIR observations globally will reduce uncertainties in climate modelling. 
•  Integration with global satellite systems will strengthen Earth observation networks. 
•  Improved data can guide climate adaptation and mitigation policies. 
•  Continued investment in CubeSat technology can make climate monitoring more scalable and cost-effective.