SGP/SIRS - SIRS E10  April 1999  (SERI-QC Results)

Data quality for this site is excellent this month. Daytime data are 100 %
present. Of the present daytime data, 98% are at or below the 5% quality 
assurance threshold. Severe flags early in the morning on the 4th through
the 21st, and on the 30th indicate that the DS, DD and NIP are above 
twilight empirical limits. Low-level flags later in the morning and around
mid-day during the second week of the month indicate that the DS is too low
by the three-component test, or that the DD or NIP is too high. Low-level
flags late in the afternoon on clear or partly cloudy days indicate the 
opposite. Heavily overcast skies pushed the DS and DD below daytime or 
twilight empirical limits on a number of occasions. On the afternoon of the
22nd   the NIP, along with the DD and DS signals, fell below daytime limits 
for a few minutes. Moderate flags later the same day indicate that the DS 
is too high by the three-component test.  No problems are notes in the UIR,
DIR or US signals.

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

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