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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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