SGP/IRT25m/C1 - Odd Instantaneous Surface IRT data

The sgpirt25mC1.a1 data for variable
   inst_sfc_ir_temp
look odd.  Each day, the first two records and the last 58 records have reasonable data 
but the remaining records are all zero. This behavior is seen all the way back to 20021121 
when the instantaneous variables were added to the sgpirt25mC1.a1 data stream.

The other instantaneous data variables do not show a similar pattern and the 60 sec 
sfc_ir_temp data look reasonable.

• Instantaneous Surface Infra-red Temperature(inst_sfc_ir_temp)

SGP/IRT25m/C1 - error in data logger program

On 12/16/2002, the logger software for the IRT25m was
inappropriately edited. This resulted in incorrect instantaneous
values at 20 and 40 seconds after each minute and incorrect 
calculation of 60-second averaged instantaneous values (because
the 20 and 40 second values are two of three instantaneous
values used to calculate this average). On 5/21/2003, the data
logger program was corrected.

• Instantaneous Surface Infra-red Temperature(inst_sfc_ir_temp)
• Instantaneous Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(inst_up_long_hemisp)
• Instantaneous Dome Temperature(inst_dome_temp)
• Instantaneous Dome Temperature(inst_up_long_dome_temp)
• Instantaneous Case Temperature(inst_up_long_case_temp)
• Instantaneous Upwelling Shortwave Hemispheric Irradiance, Pyranometer(inst_up_short_hemisp)
• Instantaneous Case Temperature(inst_case_temp)

• Instantaneous Upwelling Pygeometer Thermopile Voltage(inst_up_long_hemisp_tp)
• Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
• Instantaneous Surface Infra-red Temperature(inst_sfc_ir_temp)
• Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
• Instantaneous Upwelling Pyrgeometer Thermopile Voltage, Pyrgeometer(inst_up_short_hemisp_tp)