The longest wavelength infrared radiation band - 8 to 14 microns. Also referred to as Long Wave Infrared.

A term for the longer wavelengths of the infrared region, 25 µm-1 mm, and generally accepted shorter wavelength limit of the microwave part of the electromagnetic spectrum. Severely limited in terrestrial use, as the atmosphere transmits very little radiation in this range.

Electromagnetic radiation, longer than the thermal infrared, with wavelengths between about 25 and 1000 micrometers. See electromagnetic spectrum.