SGP/SIRS/E1 - Tracker Failure

On 7/4/2008 the tracker at this site failed.  Affected measurements are 
down_short_diffuse_hemisp (8-48) and short_direct_normal (NIP). These will be inaccurate during this time.  
PM replaced the tracker on 7/8/2008 2150.  Note that the down_short_hemisp (PSP) 
instrument was also extremely dirty during this time (see D080702.1 and DQPR 1990).  This pretty 
much makes all data from this station unusable during this time.  longwave measurements 
will be relatively unaffected by these failures.

Data is not recoverable.

• Shortwave direct normal irradiance, pyrheliometer, minima(short_direct_normal_min)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Downwelling shortwave diffuse hemispheric irradiance, pyranometer, maxima(down_short_diffuse_hemisp_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyranometer, Standard
  Deviation(down_short_diffuse_hemisp_std)
• Shortwave direct normal irradiance, pyrheliometer(short_direct_normal)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyrgeometer, Minima(down_short_diffuse_hemisp_min)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)

• Instantaneous uncorrected downwelling shortwave diffuse, shaded pyranometer
  thermopile voltage(inst_diffuse)
• Instantaneous direct normal shortwave irradiance, pyrheliometer thermopile
  voltage(inst_direct_normal)

• (Raw data stream - documentation not supported)