SGP/SIRS/E13 - Intermittent upwelling longwave

Beginning 9/19/2011 @ 15:12, the upwelling longwave values are often spiking to large and 
small values throughout the day. A multiplexer was found to be the problem and the ops 
replaced it on 10/27/2011.

Incorrect data are not recoverable for the specified time range. However, good data exists 
within the time range.  The SGPQCRAD VAP data stream provides flags for "good" data and 
appears to accurately flag bad data during this time range. Users are advised to use this 
data stream to screen for correct up_long_hemisp values.

• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Upwelling Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
  Standard Deviation(up_long_hemisp_std)
• Upwelling longwave hemispheric irradiance, pyrgeometer, maxima(up_long_hemisp_max)
• Instantaneous Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_netir)
• Instantaneous upwelling pyrgeometer case thermistor temperature, pyrgeometer(inst_up_long_case_temp)
• Instantaneous Dome Temperature(inst_up_long_dome_temp)

• Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance Pyrgeometer(inst_up_long_dome_resist)
• Instantaneous Upwelling Pyrgeometer Thermopile Pyrgeometer(inst_up_long_hemisp_tp)
• Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)