Air mass (solar energy)
Solar intensity
Solar intensity at the collector reduces with increasing airmass coefficient, but due to the complex and variable atmospheric factors involved, not in a simple or linear fashion.

Air mass (solar energy)

Section Title: Solar intensity
Table Section Text: Solar intensity at the collector reduces with increasing airmass coefficient, but due to the complex and variable atmospheric factors involved, not in a simple or linear fashion.

AM	range due to pollution	formula (I.1)	ASTM G-173

degree	W/m2	W/m2	W/m2

0	1367	1353	1347.9

0°	1	840 .. 1130 = 990 ± 15%	1040

23°	1.09	800 .. 1110 = 960 ± 16%	1020

30°	1.15	780 .. 1100 = 940 ± 17%	1010

45°	1.41	710 .. 1060 = 880 ± 20%	950

48.2°	1.5	680 .. 1050 = 870 ± 21%	930	1000.4

60°	2	560 .. 970 = 770 ± 27%	840

70°	2.9	430 .. 880 = 650 ± 34%	710

75°	3.8	330 .. 800 = 560 ± 41%	620

80°	5.6	200 .. 660 = 430 ± 53%	470

85°	10	85 .. 480 = 280 ± 70%	270

90°	38	20

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