137
(2) If the pointing error of a pyrheliometer is larger than its slope angle, the irradiance of the
pyrheliometric sensor decreases rapidly with increasing mispointing. The value can be estimated
using Fig. C1.2 and Fig. 1.3.
D 1.5 References
Allen, C.W. 1985: Astrophysical Quantities. The Athlone Press, London.
Major, G. 1995: Circumsolar Correction for Pyrheliometers and Diffusometers. WCRP, WMO/TD-
No.635
Putsay, M. 1995: Circum solar Radiation Calculated for Various Aerosol Models. IDÄJÁRÁS, vol
99, pp 67-76.
Zirin, H. 1988: Astropysics of the Sun. Cambridge University Press, Cambridge-New York-
London-New Rochelle-Melbourne-Sydney.
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