Solar flux

Solar flux (diagram)
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.

In Carnot cycle models of surface sections of the earth, as used in human thermodynamics, ecological thermodynamics, etc., the solar flux is the measure of Qin (or Qhot) of heat input during the isothermal expansion step of the heat engine cycle, in which the working body (system) does work, in the form, predominately of pressure-volume expansion work, on the surroundings (environment).

References
1. Kaufmann, William J. (1994). Universe (pg. 86). W.H. Freeman and Co.
2. Sunlight – Wikipedia.

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