longwave radiation

Radiant energy is energy that travels as electromagnetic waves. This energy can be described as discrete packets called photons or as continuous waves. It encompasses various forms, including light, X-rays, gamma rays, and thermal radiation.12

A specific type of radiant energy is longwave radiation, which has lower frequencies and longer wavelengths, typically found in the infrared part of the electromagnetic spectrum. This contrasts with shortwave radiation, like solar radiation, which has higher frequencies and shorter wavelengths, closer to visible light. Instruments called radiometers are used to detect or measure radiant energy, particularly infrared radiation. The balance of incoming solar radiation and outgoing terrestrial radiation influences Earth's temperature, with greenhouse gases playing a role in absorbing and re-emitting infrared radiation, thus affecting the planet's heat budget.3456