SGP/SIRS/E15 - NIP cable failure results in missing data

The NIP began reporting -9999 (missing) for all direct normal 
              downwelling shortwave radiation.  Maintenance 6/8 revealed a 
              broken cable. Cable was repaired and NIP data returned to normal.

Disregard this data

• Raw data stream - documentation not supported

• inst_direct_normal

• short_direct_normal
• short_direct_normal_max
• short_direct_normal_min
• short_direct_normal_std