TWP/SWF/C2 - instrument grounding problem

A grounding problem with the skyrad data logger (discussed in DQR D090605.2) created 
intermittent anomalous voltages and incorrect flux data.  Measured all-sky fluxes and derived 
cloud fraction during these periods are incorrect. The identification of clear sky 
periods during these days and estimated clear sky fluxes may also be incorrect.  Days listed in 
this DQR are periods where bad data could be clearly identified; data from other days in 
this date range should be treated with caution.

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• Measured Downwelling Global UVB Irradiance (uvb)(guvbdn_measured)
• Measured Downwelling Summed Shortwave Irradiance
  (dirfluxdn_measured+diffluxdn_measured) (ssw)(sswfluxdn_measured)
• Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
• Ratio of Measured minus Clear-sky Fit Estimated Downwelling Diffuse Shortwave
  Irradiance to Clear-sky Fit Estimated Downwelling Global Shortwave Irradiance
  (di(difcloudeffect_normalized)
• Measured Downwelling Global Shortwave Irradiance (gsw)(gswfluxdn_measured)
• Fractional Sky Cover.(cloudfraction)
• Difference: sswfluxdn_clearskyfit - sswfluxdn_measured (sswfcg)(sswfluxdn_cloudeffect)
• Measured Downwelling Direct Shortwave Irradiance (dir)(dirfluxdn_measured)
• Measured Downwelling Diffuse Shortwave Irradiance (dif)(difswfluxdn_measured)
• Average over the interval of the standard deviation of difratiodn_measured
  computed using a 3-5 sample window centered at each 1-min sample(difratiodn_measured_stdev)
• Measured Surface Albedo from Shortwave Irradiance Measurements (alb)(albedosw_measured)
• Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)
• Measured Downwelling Diffuse Irradiance to Downwelling Global Irradiance Ratio
  (difr)(difratiodn_measured)

• Measured Downwelling Diffuse Shortwave Irradiance (dif)(difswfluxdn_measured)
• Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
• Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)
• Measured Downwelling Direct Shortwave Irradiance (dir)(dirfluxdn_measured)
• Measured Downwelling Global Shortwave Irradiance (gsw)(gswfluxdn_measured)
• Measured Downwelling Summed Shortwave Irradiance
  (dirfluxdn_measured+diffluxdn_measured) (ssw)(sswfluxdn_measured)
• Measured Downwelling Diffuse Irradiance to Downwelling Global Irradiance Ratio
  (difr)(difratiodn_measured)
• Measured Surface Albedo from Shortwave Irradiance Measurements (alb)(albedosw_measured)
• Measured Downwelling Global UVB Irradiance (uvb)(guvbdn_measured)
• Difference: sswfluxdn_clearskyfit - sswfluxdn_measured (sswfcg)(sswfluxdn_cloudeffect)