SGP/SIRS - SIRS E18 April 1999  (SERI-QC Results)

Data quality at this site is good this month. All of the daytime data are present. Passing 
or low-level flags are assigned to 90.6% of the present daytime data. Data labeled 
strange-but-true make up another 6.5% of the present daytime data. Low to moderate flags 
observed in the early morning hours indicate that the DS is too low by the three-component 
test, or that the NIP or DD is too high. Heavily overcast skies cause the DD and DS to fall 
below daytime empirical limits on a number of occasions. Just before noon on the 3rd, and 
again for a few minutes late in the afternoon on the 24th, the DS falls below daytime 
empirical limits, but the DD and NIP are (moderately) flagged too high by the two-component 
test (Gompertz boundaries.) Around noon on the 5th and 6th the DS is too low by the 
three-component test, but for a short time close to noon on the 5th the DS falls into the 
physically impossible region where Kn > Kt. No problems noted in the DIR, UIR or US signals.

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

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