SGP/BRS/C1 - Monthly Summary

Data quality this site-month is good. The offset in the Global PSP has been much improved, 
with an average nighttime offset of -4 W/m^2, since measures were taken on 17 DEC 2004 
to fix it. The Global PSP does not go below nighttime empirical limits all month. Global 
does fall below daytime empirical limits for significant time periods on the 2, 4, 5, 12, 
28, 30. There were still substantial 3 component flags 17 DEC 2004. The charcteristic 
three component failures are present through out the month, especially closer to the end of 
the month. The problem is about equally as bad in the morning as the evening.

The flags are usually high level yellow at their worst for any given day. Finally, there 
are the typical three component flags on the 29th as well, but these occur under cloudy 
skies. The data return to normal the next day and a cause for the problem cannot be 
determined.

Discard the Global data before the 17th. The change out is complete as
of 2100 GMT 
o
n the 17th. Also, applying the responsivity as a function of the zenith angle, rather 
than the constant zenith angle will help with the 3 component failures.  Treat the Global data below daytime empirical limits as yellow.

• down_short_hemisp
• down_long_hemisp_shaded
• short_direct_normal
• down_short_diffuse_hemisp