§ Solar Constant (S)
=
solar flux density reaching the Earth
= 1370
W/m2
§ Solar energy incident on the Earth
= S x
the “flat” area of the Earth
= S
x p R2Earth
§ Solar energy
absorbed by the Earth
=
(received solar flux) – (reflected solar flux)
= S p
R2Earth – S p
R2Earth x
A
= S p R2Earth x (1-A)
A is the
planetary albedo of the Earth, which
is about 0.3.