Celestron CG-4 User Manual download pdf (Page 37)

OPERATION

on many parameters, for example the water vapour content in the

atmosphere (Humidity), location of the CG 4 at a certain altitude and

the suns declination angle. The following curve indicates the possible

infrared radiation in the solar spectrum in the case of low water

content in the atmosphere.

The amount of solar infrared at the CG 4 sensor is expected to be

very low (0 to 3 W/m

) because of the filter cut-on at 4.5 µm. Other

types of pyrgeometers could be affected more (0 – 10 W/m

Figure 4.2 Direct solar irradiance in Davos at solar noon,

mid of September.

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Celestron CG-4 User Manual Page 37