Solar Flux and Flux Density
q
Solar Luminosity
(
L
)
the constant flux of energy put out by the sun
L
= 3.9 x 10
26
W
q
Solar Flux Density
(
S
d
)
the amount of solar energy per unit area on a
sphere centered at the Sun with a distance
d
S
d
= L / (4
p
d
2
)
W/m
2
d
sun