Shortwave radiation: light in the visible and near-infrared wavelengths (400-3000 nm) i.e. PAR and NIR. UV light is ignored in Archimed.
Longwave radiation: light in the thermal infrared wavelengths (>3000 nanometers), also called TIR in the model.
PAR: photosynthetically active radiation. Wave band of solar radiation in the ~400 to 700 nanometers range that photosynthetic organisms are able to use in the process of photosynthesis. Also called visible light.
NIR: near-infrared radiation. Wave band of solar radiation in the ~780 to 3000 nanometers range, participating in the energy balance of the system. In fact NIR in Archimed encompass near-infrared (780-1400 nm) and short-wavelengt infrared (1400-3000 nm).
TIR: thermal infrared radiation. Wave band of solar radiation > 3000 nanometers. It is simply called thermal infrared radiation because grey-body radiation from objects in Archimed applications is almost all at far infrared wavelengths. It encompass mid (3000-8000 nm), long (8000-15000 nm) and far-wavelength (15000 nm - 1 mm) infrared radiation.