SGP/MFRSR/E8 - Instrument problem, bad 415nm channel

The measurements from the 415 nm channel are not correct.  Data from this channel 
fluctuate, drop out and are often noisy.  From the start of this DQR until around July 1, 2004, 
channel 415 data are consistently poor.  Beginning in July we see 415 often looks OK.  
From this point until the end of the DQR channel 415 is sporadically bad, with longer 
periods of good appearing data as time moves on.

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• Diffuse Narrowband Hemispheric Irradiance, Filter 1, offset corrected(diffuse_hemisp_narrowband_filter1)
• Direct horizontal narrowband irradiance, filter 1(direct_horizontal_narrowband_filter1)
• Ratio of direct_normal_filter1 to diffuse_hemisp_filter1(direct_diffuse_ratio_filter1)
• Narrowband Hemispheric Irradiance, Filter 1, offset corrected(hemisp_narrowband_filter1)
• Narrowband Direct Normal Irradiance, Filter 1(direct_normal_narrowband_filter1)
• Normalized filter function data, filter 1, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter1)
• Nominal calibration factor, applied to filter1 data(nominal_calibration_factor_filter1)

• Narrowband hemispheric irradiance, filter 1(hemisp_narrowband_filter1_raw)
• Direct horizontal narrowband irradiance, filter 1(direct_horizontal_narrowband_filter1)
• Diffuse narrowband hemispheric irradiance, filter 1(diffuse_hemisp_narrowband_filter1_raw)
• Diffuse Narrowband Hemispheric Irradiance, Filter 1, offset corrected(diffuse_hemisp_narrowband_filter1)
• Narrowband Hemispheric Irradiance, Filter 1, offset corrected(hemisp_narrowband_filter1)

• (Raw data stream - documentation not supported)

• optical depth for the Direct Narrowband Filter1(barnard_optical_depth_filter1)
• solar constant corrected for solar distance for the Direct Narrowband Filter1(michalsky_solar_constant_sdist_filter1)
• standard deviation around regression line for the Direct Narrowband Filter1(michalsky_standard_deviation_filter1)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(barnard_good_fraction_filter1)
• number of points used in final linear fit for the Direct Narrowband Filter1(michalsky_number_points_filter1)
• error in final linear fit for the Direct Narrowband Filter1(barnard_error_fit_filter1)
• solar constant corrected for solar distance for the Direct Narrowband Filter1(barnard_solar_constant_sdist_filter1)
• rejection flag for Direct Narrowband Filter1(barnard_badflag_filter1)
• rejection flag for Direct Narrowband Filter1(michalsky_badflag_filter1)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(michalsky_good_fraction_filter1)
• solar constant for the Direct Narrowband Filter1(michalsky_solar_constant_filter1)
• optical depth for the Direct Narrowband Filter1(michalsky_optical_depth_filter1)
• number of points used in final linear fit for the Direct Narrowband Filter1(barnard_number_points_filter1)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter1(barnard_error_slope_filter1)

• rejected points for the final fit for the Direct Narrowband Filter1(barnard_rejected_filter1)
• log(irradiance) for the Direct Narrowband Filter1, Barnard(barnard_lnI_filter1)
• log(irradiance) for the Direct Narrowband Filter1(michalsky_lnI_filter1)
• rejected points for the final fit for the Direct Narrowband Filter1, Michalsky(michalsky_rejected_filter1)