Astrophysics (index)about


(Solar Irradiation)
(solar energy received in given time)

Insolation is the amount of solar radiation energy striking a given amount of surface during a given time interval. Some units:

  • megajoule per square meter (MJ/m²)
  • Joule per square millimeter (J/mm²)
  • Langley (thermochemical calorie per square meter)
  • Watt-hour per square meter (Wh/m²)

The term is also used for Extra Solar Planets regarding radiation energy from their host star.