SGP/SIRS - SIRS E11 April 1999 (SERI-QC Results)

Data quality for this site is very good this month. All daytime data are present, and 96% 
of the present daytime data earn passing or low-level flags. Low-level flags are seen in 
the early morning hours under clear to fair sky conditions, indicating that the DS 
(global horizontal) is too low, or that the NIP (direct normal) or DD (diffuse horizontal) is 
too high. Overcast skies cause the DD and DS to fall below twilight or daytime empirical 
limits on a number of occasions. The suntracker failed for an hour or so on the morning of 
the 6th. During Preventive Maintenance later in the morning the alignment was adjusted. 
No problems noted in the UIR, DIR or US signals.

• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• base time in epoch(base_time)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
  Deviation(down_short_hemisp_std)
• Upwelling Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyrgeometer, Minima(down_short_diffuse_hemisp_min)
• Downwelling Longwave Hemispheric Irradiance, Pyrgeometer, Maxima(down_long_hemisp_max)
• Downwelling Longwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
  Deviation(down_long_hemisp_std)
• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• Shortwave direct normal irradiance, pyrheliometer(short_direct_normal)
• lon(lon)
• Downwelling Longwave Hemispheric Irradiance, Pyrgeometer, Minima(down_long_hemisp_min)
• Battery voltage(vBatt)
• North Latitude(lat)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(up_short_hemisp_std)
• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Maxima(up_short_hemisp_max)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer, maxima(up_long_hemisp_max)
• Shortwave direct normal irradiance, pyrheliometer, minima(short_direct_normal_min)
• Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
• Downwelling shortwave diffuse hemispheric irradiance, pyranometer, maxima(down_short_diffuse_hemisp_max)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
  Standard Deviation(up_long_hemisp_std)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyranometer, Standard
  Deviation(down_short_diffuse_hemisp_std)
• Upwelling shortwave hemispheric irradiance, pyranometer, minima(up_short_hemisp_min)
• -180.0 - +180.0(alt)
• Time offset from base_time(time_offset)

• Shaded pyranometer voltage(short_diffuse)
• -180.0 - +180.0(alt)
• Down-welling pyrgeometer dome thermistor resistance(down_long_dome_resist)
• Direct-beam normal solar irradiance(nip)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• North Latitude(lat)
• base time in epoch(base_time)
• lon(lon)
• Down-welling pyrgeometer case thermistor resistance(down_long_case_resist)
• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• Time offset from base_time(time_offset)
• Up-welling pyrgeometer dome thermistor resistance(up_long_dome_resist)
• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Up-welling pyrgeometer case thermistor resistance(up_long_case_resist)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)