ESS11
Prof. Jin-Yi Yu
Solar Flux Density Reaching Earth
q
Solar Constant
(
S
)
The solar energy density at the mean distance of
Earth from the sun (1.5
x 10
11
m)
S
= L /
(4
p
d
2
)
= (
3.9 x 10
26
W) / [4 x 3.14 x (1.5
x 10
11
m)
2
]
= 1370 W/m
2