This dataset provides hyper-spectral fields of visible and near-infrared cloud top radiance observed by the AISA Eagle instrument, which was deployed aboard the Polar 5 research aircraft. The measurements were conducted during the COMPEX-EC (Clouds over Complex Environments—EarthCARE) field study in April 2025. The COMPEX-EC campaign focused on observing Cold Air Outbreaks (CAOs) and associated cloud structures over open ocean north of the Norwegian coast. The AISA Eagle uses a single-line push broom sensor comprising 1024 across-track pixels. It captures measurements across 504 channels spanning wavelengths from 400 nm to 993 nm. The instrument features a 36.3° field of view (FOV) and achieves a high spatial resolution, typically below 1 meter for targets positioned 1 kilometer away. This comprehensive dataset allows for detailed small-scale analysis of cloud structures and properties during Arctic CAOs.

The data are stored as multiple netCDF (.nc) files, with the files for each flight zipped using 7z compression. The primary variable provided is radiance, which is the upward radiance in units of Wm−2 sr−1 nm−1. Each netCDF file also contains geolocation, attitude, and time information, including:Upward radiance (radiance)Wavelength (wavelength)Latitude (lat), Longitude (lon), and Elliptical Height (alt)Roll (roll) and Pitch (pitch) anglesDecimal hour of the day (time)