NSA/SKYRAD/C2 - Suspect PIR1
PIR1 (down_long_hemisp) data are suspect during these time ranges due to the large differences between PIR1 and PIR2 (i.e. greater than 10W/m2). Maintenance on 12/26 indicated a failed ventilator heater connector on PIR1. After 12/26 PIR1 and PIR2 returned to tracking each other within 10W/m2 as typical.
Use PIR2 (down_long_hemisp2) data. The QC flags appear to effectively call out the bad data periods.