Solar Energy Perspectives - IEA

Solar Energy Perspectives: The solar resource and its possible uses
Figure 2.4 Average yearly irradiance
500
W/m 2
400
300
200
100
0
90 o S 60 o 30 o 0 o
30 o
60 o
N 90 o
Source: unless otherwise indicated all material in figures and tables drivers from IEA data and analysis.
Figure 2.5 Total daily amount of extraterrestrial irradiance on a plane horizontal
to the earth surface
(MJ/m ) 2
40
0 o latitude
30
23.45 o latitude
20
35 o latitude
10
45 o latitude
55 o latitude
80 o latitude
0
66.55 o latitude
J F M A M J J A S O N D
Month
Source: Itacanet.
Key point
Seasonal variations are greater at higher latitudes.
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© OECD/IEA, 2011