This dataset contains longwave infrared (~12.0 microns) Arctic satellite composite imagery. The Arctic composites are made every three hours (synoptic hour) creating a total of eight images per day. Most input satellite observations included in the composite were procured within 15 minutes of the top of the synoptic hour. No image is more than +/- 50 minutes from the top of the synoptic hour. Geostationary and Polar orbiting satellites used to generate the composite can include: Polar-orbiting Operational Environmental Satellites (POES) / National Oceanic and Atmospheric Administration (NOAA), Geostationary Operational Environmental Satellites (GOES) -East and -West, METEOSAT, Meteorological Satellites (MTSAT), FY-2, Kalpana-1, and Terra/Aqua.