Kipp&Zonen BSRN Scientific Solar Monitoring System - Manual (Page 151)

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Figure D 1.4. The contribution of the circum solar sky to the irradiance of
pyrheliom etric sensors. The upper 3 curves belong to the case of continental
background aerosol and 20 degrees solar elevation, the lower 3 curves belong to
the case of m ountain aerosol and 60 degrees solar elevation. In both group of
curves the instrum ents are from the top to down: NIP, KIPP and ABS.
Figure D 1.3. Sam e as Fig. D 1.2 except the case is for continental background
aerosol and 20 degrees solar elevation.