SGP/MFRSR/E20 - Change in sampling interval

For an as of yet unknown reason, the sampling interval changed from 20 sec to 40 sec, and 
then back to 20 sec.  The exact range of data sampled at 40 sec is:  20100128235440 - 
20100131133120

There is no apparent impact on data quality, but this may impact processing scripts.

• log(irradiance) for the Direct Broadband(barnard_lnI_broadband)
• rejected points for the final fit for the Direct Narrowband Filter6, Michalsky(michalsky_rejected_filter6)
• rejected points for the final fit for the Direct Narrowband Filter5, Michalsky(michalsky_rejected_filter5)
• rejected points for the final fit for the Direct Narrowband Filter4, Michalsky(michalsky_rejected_filter4)
• rejected points for the final fit for the Direct Narrowband Filter3, Michalsky(michalsky_rejected_filter3)
• rejected points for the final fit for the Direct Narrowband Filter2(michalsky_rejected_filter2)
• rejected points for the final fit for the Direct Narrowband Filter1, Michalsky(michalsky_rejected_filter1)
• rejected points for the final fit for the Direct Narrowband Filter2(barnard_rejected_filter2)
• rejected points for the final fit for the Direct Narrowband Filter3, Barnard(barnard_rejected_filter3)
• rejected points for the final fit for the Direct Narrowband Filter4, Barnard(barnard_rejected_filter4)
• rejected points for the final fit for the Direct Narrowband Filter5, Barnard(barnard_rejected_filter5)
• rejected points for the final fit for the Direct Narrowband Filter6(barnard_rejected_filter6)
• rejected points for the final fit for the Direct Narrowband Filter1(barnard_rejected_filter1)
• log(irradiance) for the Direct Narrowband Filter5(barnard_lnI_filter5)
• log(irradiance) for the Direct Narrowband Filter6(barnard_lnI_filter6)
• log(irradiance) for the Direct Narrowband Filter3, Barnard(barnard_lnI_filter3)
• log(irradiance) for the Direct Narrowband Filter4(barnard_lnI_filter4)
• log(irradiance) for the Direct Narrowband Filter1, Barnard(barnard_lnI_filter1)
• Airmasses(barnard_airmass)
• log(irradiance) for the Direct Narrowband Filter2, Barnard(barnard_lnI_filter2)
• rejected points for the final fit for the Direct Broadband(michalsky_rejected_broadband)
• log(irradiance) for the Direct Narrowband Filter1(michalsky_lnI_filter1)
• rejected points for the final fit for the Direct Broadband, Barnard(barnard_rejected_broadband)
• airmass(michalsky_airmass)
• log(irradiance) for the Direct Narrowband Filter5, Michalsky(michalsky_lnI_filter5)
• log(irradiance) for the Direct Narrowband Filter4, Michalsky(michalsky_lnI_filter4)
• log(irradiance) for the Direct Narrowband Filter3, Michalsky(michalsky_lnI_filter3)
• log(irradiance) for the Direct Narrowband Filter2, Michalsky(michalsky_lnI_filter2)
• log(irradiance) for the Direct Narrowband Filter6, Michalsky(michalsky_lnI_filter6)
• log(irradiance) for the Direct Broadband(michalsky_lnI_broadband)
• Time offset from base_time(time_offset)

• Diffuse narrowband hemispheric irradiance, filter 1(diffuse_hemisp_narrowband_filter1_raw)
• Alltime hemispheric broadband irradiance(alltime_hemisp_broadband)
• Narrowband Direct Horizontal Irradiance, Filter 4, cosine corrected(direct_horizontal_narrowband_filter4)
• Narrowband Direct Horizontal Irradiance, Filter 5, cosine corrected(direct_horizontal_narrowband_filter5)
• Narrowband hemispheric irradiance, filter 5(hemisp_narrowband_filter5_raw)
• Narrowband Direct Horizontal Irradiance, Filter 6, cosine corrected(direct_horizontal_narrowband_filter6)
• Direct horizontal narrowband irradiance, filter 1(direct_horizontal_narrowband_filter1)
• Narrowband Direct Horizontal Irradiance, Filter 2, cosine corrected(direct_horizontal_narrowband_filter2)
• Direct Horizontal Narrowband Irradiance, Filter 3(direct_horizontal_narrowband_filter3)
• Second detector temperature(head_temp2)
• Narrowband Hemispheric Irradiance, Filter 2(hemisp_narrowband_filter2)
• Narrowband hemispheric irradiance, filter 1(hemisp_narrowband_filter1_raw)
• Narrowband hemispheric irradiance, filter 3, offset and cosine corrected(hemisp_narrowband_filter3)
• Narrowband Hemispheric Irradiance, Filter 1, offset corrected(hemisp_narrowband_filter1)
• Diffuse Narrowband Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5_raw)
• Narrowband hemispheric irradiance, filter 6, nominal wavelength is 935 nm(hemisp_narrowband_filter6)
• Narrowband hemispheric irradiance, filter 4, offset and cosine corrected(hemisp_narrowband_filter4)
• Narrowband Hemispheric Irradiance, Filter 5, offset corrected(hemisp_narrowband_filter5)
• Narrowband Hemispheric Irradiance, Filter 6(hemisp_narrowband_filter6_raw)
• Data Logger Temperature(logger_temp)
• Time offset from base_time(time_offset)
• Diffuse Hemispheric Broadband Irradiance, offset corrected(diffuse_hemisp_broadband)
• Diffuse Narrowband Hemispheric Irradiance, Filter 6, offset corrected(diffuse_hemisp_narrowband_filter6)
• Narrowband diffuse hemispheric irradiance, filter 5, offset and cosine corrected(diffuse_hemisp_narrowband_filter5)
• Diffuse Narrowband Hemispheric Irradiance, Filter 2, offset corrected(diffuse_hemisp_narrowband_filter2)
• Diffuse Narrowband Hemispheric Irradiance, Filter 1, offset corrected(diffuse_hemisp_narrowband_filter1)
• Diffuse Narrowband Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Diffuse Narrowband Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• Direct Horizontal Broadband Irradiance(direct_horizontal_broadband)
• Diffuse narrowband hemispheric irradiance, filter 6(diffuse_hemisp_narrowband_filter6_raw)
• Data logger supply voltage(logger_volt)
• Narrowband hemispheric irradiance, filter 2(hemisp_narrowband_filter2_raw)
• Diffuse Narrowband Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2_raw)
• Detector temperature(head_temp)
• Diffuse Hemispheric Broadband Irradiance(diffuse_hemisp_broadband_raw)
• Diffuse narrowband hemispheric irradiance, filter 3(diffuse_hemisp_narrowband_filter3_raw)
• Hemispheric broadband irradiance(hemisp_broadband)
• Narrowband Hemispheric Irradiance, Filter 3(hemisp_narrowband_filter3_raw)
• Alltime Narrowband Hemispheric Irradiance, Filter 6(alltime_hemisp_narrowband_filter6)
• Alltime narrowband hemispheric irradiance, filter 5(alltime_hemisp_narrowband_filter5)
• time_in_seconds_since_volume_start(time)
• Diffuse narrowband hemispheric irradiance, filter 4(diffuse_hemisp_narrowband_filter4_raw)
• Narrowband hemispheric irradiance, filter 4(hemisp_narrowband_filter4_raw)
• Alltime Narrowband Hemispheric Irradiance, Filter 4(alltime_hemisp_narrowband_filter4)
• Alltime Narrowband Hemispheric Irradiance, Filter 3(alltime_hemisp_narrowband_filter3)
• Alltime narrowband hemispheric irradiance, filter 2(alltime_hemisp_narrowband_filter2)
• Alltime narrowband hemispheric irradiance, filter 1(alltime_hemisp_narrowband_filter1)
• Hemispheric broadband irradiance(hemisp_broadband_raw)

• solar constant corrected for solar distance for the Direct Broadband(michalsky_solar_constant_sdist_broadband)
• Angstrom exponent(barnard_angstrom_exponent)
• solar constant corrected for solar distance for the Direct Narrowband Filter1(barnard_solar_constant_sdist_filter1)
• solar constant corrected for solar distance for the Direct Narrowband Filter2(barnard_solar_constant_sdist_filter2)
• Langley regression Io, adjusted to 1AU, Barnard, Direct BroadBand(barnard_solar_constant_sdist_broadband)
• solar constant corrected for solar distance for the Direct Narrowband Filter5(barnard_solar_constant_sdist_filter5)
• solar constant corrected for solar distance for the Direct Narrowband Filter6(barnard_solar_constant_sdist_filter6)
• solar constant corrected for solar distance for the Direct Narrowband Filter3(barnard_solar_constant_sdist_filter3)
• Langley regression Io, adjusted to 1AU, Barnard, Direct Narrowband Filter4(barnard_solar_constant_sdist_filter4)
• solar constant corrected for solar distance for the Direct Narrowband Filter1(michalsky_solar_constant_sdist_filter1)
• solar constant corrected for solar distance for the Direct Narrowband Filter3(michalsky_solar_constant_sdist_filter3)
• solar constant corrected for solar distance for the Direct Narrowband Filter2(michalsky_solar_constant_sdist_filter2)
• solar constant corrected for solar distance for the Direct Narrowband Filter5(michalsky_solar_constant_sdist_filter5)
• solar constant corrected for solar distance for the Direct Narrowband Filter4(michalsky_solar_constant_sdist_filter4)
• solar constant corrected for solar distance for the Direct Narrowband Filter6(michalsky_solar_constant_sdist_filter6)
• number of points used in final linear fit for the Direct Broadband(michalsky_number_points_broadband)
• percentage of initial points used in final linear fit for the Direct Broadband(michalsky_good_fraction_broadband)
• standard deviation around regression line for the Direct Narrowband Filter5(michalsky_standard_deviation_filter5)
• standard deviation around regression line for the Direct Narrowband Filter6(michalsky_standard_deviation_filter6)
• optical depth for the Direct Narrowband Filter6(michalsky_optical_depth_filter6)
• standard deviation around regression line for the Direct Narrowband Filter1(michalsky_standard_deviation_filter1)
• optical depth for the Direct Narrowband Filter4(michalsky_optical_depth_filter4)
• optical depth for the Direct Narrowband Filter5(michalsky_optical_depth_filter5)
• standard deviation around regression line for the Direct Narrowband Filter2(michalsky_standard_deviation_filter2)
• optical depth for the Direct Narrowband Filter2(michalsky_optical_depth_filter2)
• standard deviation around regression line for the Direct Narrowband Filter3(michalsky_standard_deviation_filter3)
• standard deviation around regression line for the Direct Narrowband Filter4(michalsky_standard_deviation_filter4)
• optical depth for the Direct Narrowband Filter3(michalsky_optical_depth_filter3)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter3(michalsky_good_fraction_filter3)
• optical depth for the Direct Narrowband Filter1(michalsky_optical_depth_filter1)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter2(michalsky_good_fraction_filter2)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter5(michalsky_good_fraction_filter5)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter4(michalsky_good_fraction_filter4)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter6(michalsky_good_fraction_filter6)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(michalsky_good_fraction_filter1)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter3(barnard_error_slope_filter3)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter4(barnard_error_slope_filter4)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter5(barnard_error_slope_filter5)
• optical depth for the Direct BroadBand(michalsky_optical_depth_broadband)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter6(barnard_error_slope_filter6)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter1(barnard_error_slope_filter1)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter2(barnard_error_slope_filter2)
• solar constant for the Direct Narrowband Filter6(michalsky_solar_constant_filter6)
• Langley regression Io, Michalsky, Direct Narrowband Filter5(michalsky_solar_constant_filter5)
• Langley regression Io, Michalsky, Direct Narrowband Filter4(michalsky_solar_constant_filter4)
• solar constant for the Direct Narrowband Filter3(michalsky_solar_constant_filter3)
• Langley regression Io, Michalsky, Direct Narrowband Filter2(michalsky_solar_constant_filter2)
• solar constant for the Direct Narrowband Filter1(michalsky_solar_constant_filter1)
• optical depth for the Direct Narrowband Filter1(barnard_optical_depth_filter1)
• optical depth for the Direct Narrowband Filter2(barnard_optical_depth_filter2)
• optical depth for the Direct Narrowband Filter5(barnard_optical_depth_filter5)
• optical depth for the Direct Narrowband Filter6(barnard_optical_depth_filter6)
• optical depth for the Direct Narrowband Filter3(barnard_optical_depth_filter3)
• optical depth for the Direct Narrowband Filter4(barnard_optical_depth_filter4)
• number of points used in final linear fit for the Direct Narrowband Filter6(michalsky_number_points_filter6)
• number of points used in final linear fit for the Direct Narrowband Filter5(michalsky_number_points_filter5)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter4(barnard_good_fraction_filter4)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter3(barnard_good_fraction_filter3)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter6(barnard_good_fraction_filter6)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter5(barnard_good_fraction_filter5)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter2(barnard_good_fraction_filter2)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(barnard_good_fraction_filter1)
• error in final linear fit for the Direct Narrowband Filter1(barnard_error_fit_filter1)
• error in final linear fit for the Direct Narrowband Filter2(barnard_error_fit_filter2)
• optical depth for the Direct BroadBand(barnard_optical_depth_broadband)
• percentage of initial points used in final linear fit for the Direct Broadband(barnard_good_fraction_broadband)
• error in final linear fit for the Direct Narrowband Filter3(barnard_error_fit_filter3)
• error in final linear fit for the Direct Narrowband Filter4(barnard_error_fit_filter4)
• error in final linear fit for the Direct Narrowband Filter5(barnard_error_fit_filter5)
• error in final linear fit for the Direct Narrowband Filter6(barnard_error_fit_filter6)
• number of points used in final linear fit for the Direct Broadband(barnard_number_points_broadband)
• standard deviation around regression line for the Direct BroadBand(michalsky_standard_deviation_broadband)
• number of points used in final linear fit for the Direct Narrowband Filter2(michalsky_number_points_filter2)
• error in optical depth (slope) of final linear fit for the Direct Broadband(barnard_error_slope_broadband)
• number of points used in final linear fit for the Direct Narrowband Filter1(michalsky_number_points_filter1)
• number of points used in final linear fit for the Direct Narrowband Filter4(michalsky_number_points_filter4)
• number of points used in final linear fit for the Direct Narrowband Filter3(michalsky_number_points_filter3)
• Langley regression Io, Michalsky, Direct BroadBand(michalsky_solar_constant_broadband)
• rejection flag for Direct Narrowband Filter1(michalsky_badflag_filter1)
• rejection flag for Direct Narrowband Filter2(michalsky_badflag_filter2)
• rejection flag for Direct Narrowband Filter3(michalsky_badflag_filter3)
• rejection flag for Direct Narrowband Filter4(michalsky_badflag_filter4)
• rejection flag for Direct Narrowband Filter5(michalsky_badflag_filter5)
• rejection flag for Direct Narrowband Filter6(michalsky_badflag_filter6)
• rejection flag for Direct Broadband(michalsky_badflag_broadband)
• number of points used in final linear fit for the Direct Narrowband Filter1(barnard_number_points_filter1)
• Time offset from base_time(time_offset)
• number of points used in final linear fit for the Direct Narrowband Filter6(barnard_number_points_filter6)
• number of points used in final linear fit for the Direct Narrowband Filter3(barnard_number_points_filter3)
• number of points used in final linear fit for the Direct Narrowband Filter2(barnard_number_points_filter2)
• number of points used in final linear fit for the Direct Narrowband Filter5(barnard_number_points_filter5)
• number of points used in final linear fit for the Direct Narrowband Filter4(barnard_number_points_filter4)
• error in final linear fit for the Direct BroadBand(barnard_error_fit_broadband)
• Angstrom exponent(michalsky_angstrom_exponent)
• rejection flag for Direct Broadband(barnard_badflag_broadband)
• rejection flag for Direct Narrowband Filter1(barnard_badflag_filter1)
• rejection flag for Direct Narrowband Filter6(barnard_badflag_filter6)
• rejection flag for Direct Narrowband Filter4(barnard_badflag_filter4)
• rejection flag for Direct Narrowband Filter5(barnard_badflag_filter5)
• rejection flag for Direct Narrowband Filter2(barnard_badflag_filter2)
• rejection flag for Direct Narrowband Filter3(barnard_badflag_filter3)

• Air mass(airmass)
• Direct Horizontal Broadband Irradiance(direct_horizontal_broadband)
• Time offset from base_time(time_offset)
• Detector temperature(head_temp)
• Data logger supply voltage(logger_volt)
• Ratio of direct_normal_broadband to diffuse_hemisp_broadband(direct_diffuse_ratio_broadband)
• Azimuth angle(azimuth_angle)
• Cosine correction of filter4 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter4)
• Cosine correction of filter5 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter5)
• Cosine correction of filter2 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter2)
• Cosine correction of filter3 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter3)
• Cosine correction of filter1 diffuse, assuming Rayleigh sky at 45 degree zenith
  angle(diffuse_correction_filter1)
• Alltime Narrowband Hemispheric Irradiance, Filter 4(alltime_hemisp_narrowband_filter4)
• Alltime Narrowband Hemispheric Irradiance, Filter 3(alltime_hemisp_narrowband_filter3)
• Alltime narrowband hemispheric irradiance, filter 2(alltime_hemisp_narrowband_filter2)
• Alltime narrowband hemispheric irradiance, filter 1(alltime_hemisp_narrowband_filter1)
• Narrowband Direct Normal Irradiance, Filter 3, cosine corrected(direct_normal_narrowband_filter3)
• Direct normal narrowband irradiance, filter 4, offset corrected(direct_normal_narrowband_filter4)
• Narrowband Direct Normal Irradiance, Filter 5(direct_normal_narrowband_filter5)
• Direct normal narrowband irradiance, filter 6, offset corrected(direct_normal_narrowband_filter6)
• Narrowband Direct Normal Irradiance, Filter 1(direct_normal_narrowband_filter1)
• Direct normal narrowband irradiance, filter 2, offset corrected(direct_normal_narrowband_filter2)
• Data Logger Temperature(logger_temp)
• Narrowband Direct Horizontal Irradiance, Filter 4, cosine corrected(direct_horizontal_narrowband_filter4)
• Narrowband Direct Horizontal Irradiance, Filter 5, cosine corrected(direct_horizontal_narrowband_filter5)
• Narrowband Direct Horizontal Irradiance, Filter 6, cosine corrected(direct_horizontal_narrowband_filter6)
• Direct horizontal narrowband irradiance, filter 1(direct_horizontal_narrowband_filter1)
• Narrowband Direct Horizontal Irradiance, Filter 2, cosine corrected(direct_horizontal_narrowband_filter2)
• Direct Horizontal Narrowband Irradiance, Filter 3(direct_horizontal_narrowband_filter3)
• Hemispheric broadband irradiance(hemisp_broadband)
• Solar zenith angle(solar_zenith_angle)
• Cosine correction of broadband diffuse, assuming Rayleigh sky at 45 degree
  zenith angle(diffuse_correction_broadband)
• Alltime Narrowband Hemispheric Irradiance, Filter 6(alltime_hemisp_narrowband_filter6)
• Alltime narrowband hemispheric irradiance, filter 5(alltime_hemisp_narrowband_filter5)
• Cosine correction of filter6 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter6)
• Alltime hemispheric broadband irradiance(alltime_hemisp_broadband)
• Elevation angle(elevation_angle)
• Direct Normal Broadband Irradiance, cosine corrected, broadband scale applied(direct_normal_broadband)
• Diffuse Narrowband Hemispheric Irradiance, Filter 6, offset corrected(diffuse_hemisp_narrowband_filter6)
• Narrowband diffuse hemispheric irradiance, filter 5, offset and cosine corrected(diffuse_hemisp_narrowband_filter5)
• Diffuse Narrowband Hemispheric Irradiance, Filter 2, offset corrected(diffuse_hemisp_narrowband_filter2)
• Diffuse Narrowband Hemispheric Irradiance, Filter 1, offset corrected(diffuse_hemisp_narrowband_filter1)
• Cosine solar zenith angle(cosine_solar_zenith_angle)
• Diffuse Narrowband Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Diffuse Narrowband Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• Second detector temperature(head_temp2)
• time_in_seconds_since_volume_start(time)
• Ratio of direct_normal_narrowband_filter3 to diffuse_hemisp_narrowband_filter3(direct_diffuse_ratio_filter3)
• Ratio of direct_normal_filter4 to diffuse_hemisp_filter4(direct_diffuse_ratio_filter4)
• Ratio of direct_normal_filter1 to diffuse_hemisp_filter1(direct_diffuse_ratio_filter1)
• Ratio of direct_normal_filter2 to diffuse_hemisp_filter2(direct_diffuse_ratio_filter2)
• Ratio of direct_normal_filter5 to diffuse_hemisp_filter5(direct_diffuse_ratio_filter5)
• Ratio of direct_normal_narrowband_filter6 to diffuse_hemisp_narrowband_filter6(direct_diffuse_ratio_filter6)
• Narrowband Hemispheric Irradiance, Filter 1, offset corrected(hemisp_narrowband_filter1)
• Narrowband Hemispheric Irradiance, Filter 2(hemisp_narrowband_filter2)
• Narrowband hemispheric irradiance, filter 3, offset and cosine corrected(hemisp_narrowband_filter3)
• Diffuse Hemispheric Broadband Irradiance, offset corrected(diffuse_hemisp_broadband)
• Narrowband hemispheric irradiance, filter 4, offset and cosine corrected(hemisp_narrowband_filter4)
• Narrowband Hemispheric Irradiance, Filter 5, offset corrected(hemisp_narrowband_filter5)
• Narrowband hemispheric irradiance, filter 6, nominal wavelength is 935 nm(hemisp_narrowband_filter6)