Kippzonen BSRN Scientific Solar Monitoring System Uživatelský manuál stáhnout pdf (Strana 132)

120

Figure C 2.3. Measured sky functions and their approximations by ones

calculated for model atmosphere containing rural aerosol and haze particles.

Diffusometer Diffuse radiation

from 0.5

Circum 1

0.5 – 1.0

Circum 2

1.0 - Z

“Measured”

value

Australia I 160 -3.11 -8.47 148.4

Australia II 160 -3.11 -8.51 148.4

Austria 160 -3.11 -16.90 140.0

Germany I 160 -3.11 -15.96 141.0

Germany II 160 -3.11 -9.90 147.0

Germany III 160 -3.11 -8.46 148.3

Hungary I 160 -3.11 -8.53 148.4

Hungary II 160 -3.11 -10.41 146.5

Hungary III 160 -3.11 -11.92 145.8

USA 160 -3.11 -10.03 146.9

Table C 2.2a. Diffusometer irradiances in W m .

-2

The radiation coming from the solar disk and from the belt up to 0.5 degree around it is excluded. The

circumsolar radiance is divided into two parts. Z means the limit angle of the diffusometer.

C 2.3 The measurement method

Between March of 1996 and August of 1997 three diffusometer of shading sphere were operated in

Budapest using a SciTec solar tracker. Their characteristics are shown in Table C 2.1. The sampling

of outputs were made at each 10 seconds, the stored data are 10 minutes averages. Due to different

reasons, the operation was not continuous during the 18 months period, this way only the 60 percent

of the possible daytime 10 minutes averages are available (cc. 33000 “readings”). The time series

contain every kind of atmospheric conditions and solar elevation (up to 66 degrees) happened in that

period. The data were processed in the year 2000 only.

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 187 188

Kippzonen BSRN Scientific Solar Monitoring System Uživatelský manuál Strana 132