SGP/MFRSR/E13 - Reprocess: Angstrom Exponent Error

The data used to calculate the angstrom exponent was incorrect.  These
fields should not be used.  All other fields are considered good.

• Angstrom exponent(barnard_angstrom_exponent)
• Angstrom exponent(michalsky_angstrom_exponent)

HFE/MPL/M1 - Frosting/Condensation

On various days during the China deployment, condensation accumulated on the view port 
window of the MPL and compromised its capability to detect clouds.  This problem most often 
occurred during nighttime hours from May through early September.  

During the listed times, cloud retrievals and aerosol profiles should be considered 
doubtful or in error.

The dates/times of occurrence are:
16:00-23:59 GMT on 05/18
17:00-22:00 GMT on 05/23
20:00-22:00 GMT on 05/25
15:00-23:59 GMT on 06/07
17:00-23:59 GMT on 06/08
15:00-23:00 GMT on 06/09
14:00-18:00 GMT on 06/18
18:00-21:00 GMT on 06/21
14:00-16:00 GMT on 06/23
16:00-21:00 GMT on 06/27
17:00-20:00 GMT on 06/28
      22:00 GMT on 06/29
19:00-23:00 GMT on 06/30
13:30-22:30 GMT on 07/02
16:00-17:30 GMT on 07/03 
20:30-22:00 GMT on 07/03
21:30-22:30 GMT on 07/05
13:00-22:00 GMT on 07/06
17:00-18:00 GMT on 07/07
21:00-22:30 GMT on 07/07
16:00-23:59 GMT on 07/10
11:00-23:00 GMT on 07/11
18:00-23:00 GMT on 07/12
15:00-16:00 GMT on 07/13
18:00-23:59 GMT on 07/14
18:00-21:00 GMT on 07/15
17:30-23:00 GMT on 07/16
17:00-23:00 GMT on 07/17
13:00-23:30 GMT on 07/20
18:00-23:00 GMT on 07/24
21:00-23:00 GMT on 07/25
21:00-22:30 GMT on 07/27
12:00-23:59 GMT on 08/02
16:00-21:30 GMT on 08/03
16:00-23:00 GMT on 08/04
14:00-22:30 GMT on 08/05
19:00-23:00 GMT on 08/07
19:00-21:30 GMT on 08/08
15:00-23:30 GMT on 08/10
17:30-23:30 GMT on 08/12
14:00-15:00 GMT on 08/14
16:30-22:30 GMT on 08/14
21:30-22:30 GMT on 08/17
12:00-23:59 GMT on 08/18
12:00-13:30 GMT on 08/19
20:00-23:30 GMT on 08/19
15:00-23:59 GMT on 08/20
11:00-23:59 GMT on 08/22
11:00-23:30 GMT on 08/23
12:00-23:30 GMT on 08/25
13:00-23:30 GMT on 08/26
16:30-23:59 GMT on 08/27
17:00-23:00 GMT on 08/31
15:00-23:59 GMT on 09/01
15:00-20:00 GMT on 09/02
19:30-23:59 GMT on 09/05
16:30-22:30 GMT on 09/09
19:30-23:59 GMT on 09/12
20:30-23:59 GMT on 09/15
14:00-16:30 GMT on 09/16
19:00-23:59 GMT on 09/16
20:30-23:59 GMT on 10/29
22:00-23:59 GMT on 11/01
20:00-23:59 GMT on 11/23
00:00-02:00 GMT on 11/24

• lon(lon)
• *(aqc_signal_return_cross_pol)
• Detector Temperature(detector_temp)
• Background signal standard deviation, cross-pol(background_signal_std_cross_pol)
• Dead time correction flag(dead_time_corrected)
• Dummy altitude for Zeb(alt)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• *(aqc_signal_return_co_pol)
• range(range)
• Number of samples used for cross-pol averages(nsamples_cross_pol_average)
• Number of detector channels(num_channels)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• Laser output energy per pulse(energy_monitor)
• lat(lat)
• Number of bins stored in data block(num_bins)
• base time(base_time)
• Background signal, co-pol(background_signal_co_pol)
• Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
• Polarization control voltage, cross-pol(polarization_control_voltage_cross_pol)
• Number of samples used for co-pol averages(nsamples_co_pol_average)
• Telescope temperature(scope_temp)
• Background signal standard deviation, co-pol(background_signal_std_co_pol)
• Attenuated backscatter, cross-pol(signal_return_cross_pol)
• Number of laser pulses summed during averaging interval(shots_per_sample)
• Background signal, cross-pol(background_signal_cross_pol)
• Time offset of tweaks from base_time(time_offset)
• Array of heights for the range gates(height)
• Polarization control voltage, co-pol(polarization_control_voltage_co_pol)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
• Attenuated backscatter, co-pol(signal_return_co_pol)
• time(time)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Laser Temperature(laser_temp)

• Preliminary cloud base height(preliminary_cbh)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• Polarization control enabled flag(polarization_control)
• lat(lat)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• Attenuated backscatter(signal_return)
• Number of laser pulses summed during averaging interval(shots_per_avg)
• Laser Temperature(laser_temp)
• base time(base_time)
• Number of bins stored in data block(num_bins)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Dummy altitude for Zeb(alt)
• Array of heights for the range gates(height)
• Background signal standard deviation(background_signal_std)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Number of detector channels(num_channels)
• lon(lon)
• Background Signal(background_signal)
• Polarization control voltage setting(polarization_control_voltage)
• Telescope temperature(scope_temp)
• Detector Temperature(detector_temp)
• Dead time correction flag(dead_time_corrected)
• range(range)
• Time offset of tweaks from base_time(time_offset)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• time(time)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• Laser output energy per pulse(energy_monitor)

• lat(lat)
• base time(base_time)
• Background signal, co-pol(background_signal_co_pol)
• Laser Temperature(laser_temp)
• Dead time correction flag(dead_time_corrected)
• Number of samples used for cross-pol averages(nsamples_cross_pol_average)
• Attenuated backscatter, co-pol(signal_return_co_pol)
• Dummy altitude for Zeb(alt)
• Number of laser pulses summed during averaging interval(shots_per_sample)
• Polarization control voltage, co-pol(polarization_control_voltage_co_pol)
• Background signal, cross-pol(background_signal_cross_pol)
• time(time)
• Laser output energy per pulse(energy_monitor)
• Time offset of tweaks from base_time(time_offset)
• Array of heights for the range gates(height)
• Background signal standard deviation, co-pol(background_signal_std_co_pol)
• Telescope temperature(scope_temp)
• Background signal standard deviation, cross-pol(background_signal_std_cross_pol)
• Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
• Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
• Number of bins stored in data block(num_bins)
• *(aqc_signal_return_co_pol)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Attenuated backscatter, cross-pol(signal_return_cross_pol)
• *(aqc_signal_return_cross_pol)
• Number of detector channels(num_channels)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• Number of samples used for co-pol averages(nsamples_co_pol_average)
• lon(lon)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• Detector Temperature(detector_temp)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• Polarization control voltage, cross-pol(polarization_control_voltage_cross_pol)
• range(range)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)

SGP/MFRSR/E13 - Shadowband misalignment

The E13 MFRSR developed a shading problem on or about 05/04.  (The exact date when this 
problem started is difficult to pin down exactly.) The shading problem is easy to identify 
on a clear day because plots of direct beam and diffuse irradiance versus time become 
"fuzzy".  The total irradiance is not affected.
  

In response to the shading problem, a whole sequence of events then ensued: these actions 
were designed to solve the shading problem but did not succeed until the very end.

Here's a rundown of what took place:

98/05/11 - shadowband adjustment was made at 1544 GMT
         - this adjustment corrected the shading problem that 
           occurred in the morning, but inadvertently caused
           a PM shading problem 
98/05/20 - shadowband adjustment at 1804 GMT
98/05/21 - shadowband adjustment at 1630 GMT
98/06/01 - shadowband adjustment at 1910 GMT
98/06/02 - shadowband adjustmnet at 1550 GMT

Alas, these adjustments did not solve the shading problem and
it seemed to get worse (for example, on 06/11 the shading 
is VERY BAD from sunup until about 1500 LST).

98/06/16 - shadowband adjustment at 1715 GMT

This final adjustment seems to a solved the problem!

• Narrowband Direct Horizontal Irradiance, Filter 5(direct_horizontal_narrowband_filter5)
• Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
• Direct Normal Broadband Irradiance broadband scale applied(direct_normal_broadband)
• Narrowband Direct Horizontal Irradiance, Filter 6(direct_horizontal_narrowband_filter6)
• Direct Normal Narrowband Irradiance, Filter 5(direct_normal_narrowband_filter5)
• Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
• Direct Normal Narrowband Irradiance, Filter 3(direct_normal_narrowband_filter3)
• Direct Normal Narrowband Irradiance, Filter 2(direct_normal_narrowband_filter2)
• Direct Normal Narrowband Irradiance, Filter 1(direct_normal_narrowband_filter1)
• Narrowband Direct Horizontal Irradiance, Filter 3(direct_horizontal_narrowband_filter3)
• Direct Normal Narrowband Irradiance, Filter 6(direct_normal_narrowband_filter6)
• Direct Normal Narrowband Irradiance, Filter 4(direct_normal_narrowband_filter4)
• Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
• Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
• Narrowband Direct Horizontal Irradiance, Filter 2(direct_horizontal_narrowband_filter2)
• Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
• Narrowband Direct Horizontal Irradiance, Filter 4(direct_horizontal_narrowband_filter4)
• Narrowband Direct Horizontal Irradiance, Filter 1(direct_horizontal_narrowband_filter1)
• Direct Horizontal Broadband Irradiance, broadband scale applied(direct_horizontal_broadband)

• Direct Horizontal Broadband Irradiance, broadband scale applied(direct_horizontal_broadband)
• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
• Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
• Narrowband Direct Horizontal Irradiance, Filter 6(direct_horizontal_narrowband_filter6)
• Narrowband Direct Horizontal Irradiance, Filter 4(direct_horizontal_narrowband_filter4)
• Narrowband Direct Horizontal Irradiance, Filter 2(direct_horizontal_narrowband_filter2)
• Narrowband Direct Horizontal Irradiance, Filter 5(direct_horizontal_narrowband_filter5)
• Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
• Narrowband Direct Horizontal Irradiance, Filter 1(direct_horizontal_narrowband_filter1)
• Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
• Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
• Narrowband Direct Horizontal Irradiance, Filter 3(direct_horizontal_narrowband_filter3)

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

• number of points used in final linear fit for the Direct Broadband(michalsky_number_points_broadband)
• rejection flag for Direct Narrowband Filter4(michalsky_badflag_filter4)
• standard deviation around regression line for the Direct Narrowband Filter4(michalsky_standard_deviation_filter4)
• rejection flag for Direct Narrowband Filter1(michalsky_badflag_filter1)
• error in final linear fit for the Direct Narrowband Filter4(barnard_error_fit_filter4)
• standard deviation around regression line for the Direct Narrowband Filter5(michalsky_standard_deviation_filter5)
• number of points used in final linear fit for the Direct Narrowband Filter1(michalsky_number_points_filter1)
• rejection flag for Direct Narrowband Filter6(barnard_badflag_filter6)
• standard deviation around regression line for the Direct Narrowband Filter3(michalsky_standard_deviation_filter3)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(barnard_good_fraction_filter1)
• optical depth for the Direct Narrowband Filter4(barnard_optical_depth_filter4)
• percentage of initial points used in final linear fit for the Direct Broadband(barnard_good_fraction_broadband)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(michalsky_good_fraction_filter1)
• rejection flag for Direct Narrowband Filter5(barnard_badflag_filter5)
• rejection flag for Direct Narrowband Filter5(michalsky_badflag_filter5)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter3(barnard_good_fraction_filter3)
• standard deviation around regression line for the Direct Narrowband Filter2(michalsky_standard_deviation_filter2)
• 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 Filter3(barnard_number_points_filter3)
• rejection flag for Direct Broadband(barnard_badflag_broadband)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter5(barnard_good_fraction_filter5)
• optical depth for the Direct Narrowband Filter6(barnard_optical_depth_filter6)
• error in final linear fit for the Direct Narrowband Filter5(barnard_error_fit_filter5)
• number of points used in final linear fit for the Direct Narrowband Filter3(michalsky_number_points_filter3)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter3(michalsky_good_fraction_filter3)
• number of points used in final linear fit for the Direct Broadband(barnard_number_points_broadband)
• optical depth for the Direct Narrowband Filter3(michalsky_optical_depth_filter3)
• number of points used in final linear fit for the Direct Narrowband Filter2(michalsky_number_points_filter2)
• rejection flag for Direct Narrowband Filter1(barnard_badflag_filter1)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter2(michalsky_good_fraction_filter2)
• error in final linear fit for the Direct Narrowband Filter6(barnard_error_fit_filter6)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter4(barnard_error_slope_filter4)
• 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
  Filter6(michalsky_good_fraction_filter6)
• percentage of initial points used in final linear fit for the Direct Broadband(michalsky_good_fraction_broadband)
• optical depth for the Direct BroadBand(michalsky_optical_depth_broadband)
• optical depth for the Direct Narrowband Filter2(michalsky_optical_depth_filter2)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter4(michalsky_good_fraction_filter4)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter6(barnard_error_slope_filter6)
• optical depth for the Direct Narrowband Filter4(michalsky_optical_depth_filter4)
• rejection flag for Direct Narrowband Filter6(michalsky_badflag_filter6)
• number of points used in final linear fit for the Direct Narrowband Filter5(barnard_number_points_filter5)
• optical depth for the Direct Narrowband Filter5(barnard_optical_depth_filter5)
• number of points used in final linear fit for the Direct Narrowband Filter6(barnard_number_points_filter6)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter6(barnard_good_fraction_filter6)
• optical depth for the Direct Narrowband Filter1(michalsky_optical_depth_filter1)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter2(barnard_error_slope_filter2)
• optical depth for the Direct Narrowband Filter6(michalsky_optical_depth_filter6)
• error in final linear fit for the Direct BroadBand(barnard_error_fit_broadband)
• 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(barnard_good_fraction_filter4)
• standard deviation around regression line for the Direct Narrowband Filter6(michalsky_standard_deviation_filter6)
• number of points used in final linear fit for the Direct Narrowband Filter4(michalsky_number_points_filter4)
• rejection flag for Direct Narrowband Filter3(michalsky_badflag_filter3)
• Angstrom exponent(michalsky_angstrom_exponent)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter5(barnard_error_slope_filter5)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter3(barnard_error_slope_filter3)
• rejection flag for Direct Narrowband Filter2(barnard_badflag_filter2)
• rejection flag for Direct Broadband(michalsky_badflag_broadband)
• error in final linear fit for the Direct Narrowband Filter2(barnard_error_fit_filter2)
• optical depth for the Direct Narrowband Filter1(barnard_optical_depth_filter1)
• number of points used in final linear fit for the Direct Narrowband Filter4(barnard_number_points_filter4)
• Angstrom exponent(barnard_angstrom_exponent)
• 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 Filter1(barnard_number_points_filter1)
• optical depth for the Direct Narrowband Filter2(barnard_optical_depth_filter2)
• rejection flag for Direct Narrowband Filter2(michalsky_badflag_filter2)
• error in final linear fit for the Direct Narrowband Filter3(barnard_error_fit_filter3)
• number of points used in final linear fit for the Direct Narrowband Filter5(michalsky_number_points_filter5)
• rejection flag for Direct Narrowband Filter3(barnard_badflag_filter3)
• error in optical depth (slope) of final linear fit for the Direct Broadband(barnard_error_slope_broadband)
• optical depth for the Direct BroadBand(barnard_optical_depth_broadband)
• rejection flag for Direct Narrowband Filter4(barnard_badflag_filter4)
• standard deviation around regression line for the Direct Narrowband Filter1(michalsky_standard_deviation_filter1)
• error in final linear fit for the Direct Narrowband Filter1(barnard_error_fit_filter1)
• optical depth for the Direct Narrowband Filter5(michalsky_optical_depth_filter5)
• number of points used in final linear fit for the Direct Narrowband Filter2(barnard_number_points_filter2)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter1(barnard_error_slope_filter1)
• optical depth for the Direct Narrowband Filter3(barnard_optical_depth_filter3)