SGP/MFRSR/E13 - shading problems

The E13 MFRSR developed a shading problem on or about 98/05/04.  (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 98/06/11 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!

• extraterrestrial spectral irradiance used for optical depth calculations,
  corrected for eccentricity of earth\'s orbit(io_filter2)
• total optical depth direct narrowband filter 3(total_optical_depth_filter3)
• totaloptical depth direct narrowband filter 2(total_optical_depth_filter2)
• angstrom exponent(angstrom_exponent)
• aerosol optical depth filter 1(aerosol_optical_depth_filter1)
• aerosol optical depth filter 2(aerosol_optical_depth_filter2)
• aerosol optical depth filter 3(aerosol_optical_depth_filter3)
• total optical depth direct narrowband filter 5(total_optical_depth_filter5)
• aerosol optical depth filter 5(aerosol_optical_depth_filter5)
• total optical depth direct narrowband filter 4(total_optical_depth_filter4)
• aerosol optical depth filter 4(aerosol_optical_depth_filter4)
• extraterrestrial spectral irradiance used for optical depth calculations,
  corrected for eccentricity of earth\'s orbit(io_filter4)
• total optical depth direct narrowband filter 1(total_optical_depth_filter1)
• extraterrestrial spectral irradiance used for optical depth calculations,
  corrected for eccentricity of earth\'s orbit(io_filter5)
• extraterrestrial spectral irradiance used for optical depth calculations,
  corrected for eccentricity of earth\'s orbit(io_filter3)
• extraterrestrial spectral irradiance used for optical depth calculations,
  corrected for eccentricity of earth\'s orbit(io_filter1)

• Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
• Direct Normal Broadband Irradiance(direct_normal_broadband)
• Narrowband Direct Normal 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)
• Narrowband Direct Normal Irradiance, Filter 3(direct_normal_narrowband_filter3)
• Narrowband Direct Normal Irradiance, Filter 2(direct_normal_narrowband_filter2)
• Narrowband Direct Normal Irradiance, Filter 1(direct_normal_narrowband_filter1)
• Narrowband Direct Normal Irradiance, Filter 6(direct_normal_narrowband_filter6)
• Narrowband Direct Normal 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 Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)

• Narrowband Direct Normal Irradiance, Filter 4(direct_normal_narrowband_filter4)
• Narrowband Direct Normal Irradiance, Filter 5(direct_normal_narrowband_filter5)
• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Narrowband Direct Normal Irradiance, Filter 6(direct_normal_narrowband_filter6)
• Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
• Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
• Narrowband Direct Normal Irradiance, Filter 3(direct_normal_narrowband_filter3)
• Narrowband Direct Normal Irradiance, Filter 2(direct_normal_narrowband_filter2)
• Narrowband Direct Normal Irradiance, Filter 1(direct_normal_narrowband_filter1)
• Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
• Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
• Direct Normal Broadband Irradiance(direct_normal_broadband)
• Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)

• rejected points for the final fit for the Direct Narrowband Filter1(michalsky_rejected_filter1)
• rejected points for the final fit for the Direct Broadband(barnard_rejected_broadband)
• log(irradiance) for the Direct Narrowband Filter6(barnard_lnI_filter6)
• log(irradiance) for the Direct Broadband(barnard_lnI_broadband)
• rejected points for the final fit for the Direct Narrowband Filter6(barnard_rejected_filter6)
• log(irradiance) for the Direct Narrowband Filter2(barnard_lnI_filter2)
• log(irradiance) for the Direct Narrowband Filter3(barnard_lnI_filter3)
• log(irradiance) for the Direct Narrowband Filter1(michalsky_lnI_filter1)
• log(irradiance) for the Direct Narrowband Filter5(barnard_lnI_filter5)
• log(irradiance) for the Direct Narrowband Filter3(michalsky_lnI_filter3)
• rejected points for the final fit for the Direct Narrowband Filter2(barnard_rejected_filter2)
• log(irradiance) for the Direct Broadband(michalsky_lnI_broadband)
• log(irradiance) for the Direct Narrowband Filter4(barnard_lnI_filter4)
• log(irradiance) for the Direct Narrowband Filter4(michalsky_lnI_filter4)
• log(irradiance) for the Direct Narrowband Filter6(michalsky_lnI_filter6)
• rejected points for the final fit for the Direct Narrowband Filter3(barnard_rejected_filter3)
• rejected points for the final fit for the Direct Narrowband Filter4(barnard_rejected_filter4)
• rejected points for the final fit for the Direct Narrowband Filter1(barnard_rejected_filter1)
• log(irradiance) for the Direct Narrowband Filter2(michalsky_lnI_filter2)
• rejected points for the final fit for the Direct Narrowband Filter5(michalsky_rejected_filter5)
• log(irradiance) for the Direct Narrowband Filter1(barnard_lnI_filter1)
• rejected points for the final fit for the Direct Narrowband Filter6(michalsky_rejected_filter6)
• rejected points for the final fit for the Direct Narrowband Filter5(barnard_rejected_filter5)
• log(irradiance) for the Direct Narrowband Filter5(michalsky_lnI_filter5)
• rejected points for the final fit for the Direct Narrowband Filter2(michalsky_rejected_filter2)
• rejected points for the final fit for the Direct Narrowband Filter4(michalsky_rejected_filter4)
• rejected points for the final fit for the Direct Broadband(michalsky_rejected_broadband)
• rejected points for the final fit for the Direct Narrowband Filter3(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)
• optical depth for the Direct Narrowband Filter4(barnard_optical_depth_filter4)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter1(barnard_good_fraction_filter1)
• 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)
• optical depth for the Direct Narrowband Filter5(barnard_optical_depth_filter5)
• 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 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)
• optical depth for the Direct Narrowband Filter1(barnard_optical_depth_filter1)
• error in final linear fit for the Direct Narrowband Filter2(barnard_error_fit_filter2)
• 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)

SGP/MFR10M/C1 - Head heater not working

On 19990415, the tower upon which the 10-m MFR was mounted was dismantled and replaced 
with a so-called "tippy tower".  After the 10-m MFR was reinstalled on the new tower, the 
mfr head heater did not work, or worked intermittently (at best).  A new mfr head was 
installed on 99.09.02 and that solved the problem.  

Data was collected from the old head in the morning up to the time it was replaced.  Once 
the new head was installed, data collection resumed.  There's a gap of about an hour 
between the time the old head was removed and the new head was installed.  If we try to gauge 
how well the old head was calibrated by comparing the two segments of data (old head, 
new head) it appears as if the old head remained in a good state of calibration even though 
the head heater was not working.

• Detector Temperature(head_temp)

• Detector Temperature(head_temp)