SOLAR CONSTANT Wm W m -2 is radiated on a plane tangent to the Earth at all times – the “Solar Constant.” This amounts to only.

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Presentation transcript:

SOLAR CONSTANT

1366 Wm -2

W m -2 is radiated on a plane tangent to the Earth at all times – the “Solar Constant.” This amounts to only about one two- billionth of the power emitted from the Sun!

2. This energy falls over a circular area of (π r 2 ) square meters, where r is the radius of the earth, to give 1366πr 2 total Watts of energy. r W m -2 ) is radiated on a plane tangent to the Earth at all times – the “Solar Constant.” This amounts to only about one two- billionth of the power emitted from the Sun!

Note to artist: Make this the Earth, with land and ocean, etc. Ideally, it should tilt on its axis an the same angle as the Earths on spread 02.05A. 2. This energy falls over a circular area of (π r 2 ) square meters, where r is the radius of the earth, to give 1366πr 2 total Watts of energy. r r Note to artist: Make this the Earth, with land and ocean, etc. Ideally, it should tilt on its axis an the same angle as the Earths on spread 02.05A. r r W m -2 is radiated on a plane tangent to the Earth at all times – the “Solar Constant.” This amounts to only about one two- billionth of the power emitted from the Sun! 3. But these 1366 πr 2 Watts fall over the entire surface area of Earth. The surface area of any sphere is 4πr 2, so 1366πr 2 W / 4πr 2 square meters, or 342 W m -2.

CAN THE SUN CHANGE ITS ENERGY OUTPUT?