After instrument replacement 8/5/2010 approx 1700GMT the short_direct_normal values became
intermittent due to a failed NIP connector. Ops repaired the connector on 8/10
rectifying the problem.
The short_direct_normal (NIP instrument) data are not recoverable during this period.
Although there will be greater uncertainty the short_direct_normal can be reconstructed from
the global and diffuse measurements for each minute of
data using the following relationship:
down_short_hemisp = short_direct_normal*cos(zenith angle) + down_short_diffuse. |