NSA/GNDRAD/C2 - Upwelling PIR measurement - spikes in thermopile signal

ULH measurements have many spikes at this site.  On 2/03, the anomalous spikes become 
frequent and are very noticeable from 0027 - 0445 UTC.  Negative and positive spikes occur on 
seemingly random days until 5/27/2004.  Extensive troublshooting could not resolve 
problem, including a datalogger changout on 4/22.  Problem seems to have resolved itself with 
the last spikes occuring on 5/27/2004 approximately 1500GMT.  No problems with upwelling 
PIR noise are evident up until and after the conversion from Zeno to Campbell dataloggers 
on 11/22/2004.

review upwelling PIR (ULH) data before using.

• up_long_hemisp_min
• up_long_hemisp
• pir1_min
• up_long_hemisp_max
• up_long_hemisp_std
• pir1_sd
• pir1_max
• pir1_mean

• pir1_voltage
• inst_up_long_hemisp_tp

• Raw data stream - documentation not supported