Solar flux refers to the amount of energy emitted from the sun in the form of electromagnetic radiation. It describes the total amount of solar energy received on Earth at a specific frequency. Synonyms for solar flux include solar irradiance, solar power, and solar radiance. These terms all describe the same phenomenon, but they may be used in different contexts or with slightly different meanings. Solar power, for example, may refer specifically to the use of solar energy to generate electricity. Solar radiance, on the other hand, can describe both the energy emitted by the sun as well as the brightness or luminosity of the sun itself.