TWP/SKYRAD/C2 - IRT measurement error

The IRT was not properly calibrated and was not able to measure sky temperatures below 
273.2 K. (This instrument was the same one damaged by lightning in November 2005 in Darwin. 
It was returned for repair and received a new lens but was calibrated only down to 0 deg 
C, so the problem was neither detected nor repaired.) The IRT was replaced on 2/22/2007.

Ignore measurements below 276 K.

• sky_ir_temp_max
• sky_ir_temp
• sky_ir_temp_min
• sky_ir_temp_std