Solar flux: at sphere of radius 1 AU (150,000,000 km), with the sun at its center, through each square meter of that sphere's surface pass 1370 watts (joules per second) of energy.
In science, solar flux is 1370 watts per meters squared at one astronomical unit from the sun. [1] This is the amount of total energy, released by the sun, passing through one m² of surface area, at the radii distance of 150,000,000 km (the earth) from the sun, at a rate of joules per second. [2] This value is also called the solar constant.
