| Description: | Beginning on 12/23/2013 approx. 16:00GMT the down_short_hemisp (PSP instrument) ventilator
fan failed. Site Ops repaired the ventilator and returned the instrument to service on
1/7/2014.
The down_short_hemisp data are not recoverable during this time range. However, users can
reconstruct the data using the following relationship between the down_short_hemisp and
the short_direct_normal and short_diffuse_hemisp data for each one minute measurement:
down_short_hemisp = short_direct_normal * cos(zenith angle) + short_diffuse_hemisp
Problem should not adversely affect any overlying VAPs such as the QCRAD that will use
this relationship as determined by QC flags. |