SGP/MFRSR/E1 - 420nm and 500nm channels flat-lining

Channel 415 and sometimes 500 are over-ranging, i.e., the signal overloads the sensor and 
the result is flat data bounding solar noon.  Typically the affected time range is 
between 1730 and 2000 UTC, though on partly cloudy days the time range expands slightly.  
Global, diffuse and direct data will all be affected and should not be used when the signal is 
over-ranging.  Only channels 415 and 500 are affected.

• Radiation, shortwave, diffuse hemispheric irradiance, 500 nm wavelength (diffuse_hemisp_narrowband_filter2)
• direct_horizontal_narrowband_filter2
• Radiation, shortwave, hemispheric irradiance, 415 nm wavelength (hemisp_narrowband_filter1)
• direct_horizontal_narrowband_filter1
• Radiation, shortwave, hemispheric irradiance, 500 nm wavelength(hemisp_narrowband_filter2)
• Direct normal narrowband irradiance, filter 2(direct_normal_narrowband_filter2)
• Radiation, shortwave, direct normal irradiance, 415 nm wavelength(direct_normal_narrowband_filter1)
• Radiation, shortwave, diffuse hemispheric irradiance, 415 nm wavelength (diffuse_hemisp_narrowband_filter1)

SGP/MFRSR/E1 - Instrument maintenance

Coinciding with a tech visit to the site, the instrument suffered a step function in the 
data. After the "step" the relative intensities dropped across all channels, and the 
relative position changed for channel 415 as well.  Investigation into the cause of the step 
has yielded no answers.

In the end this will likely be nothing more than a curiosity as the Langley plots and 
calibrations are not dependent on absolute calibration.

• direct_horizontal_narrowband_filter6
• direct_horizontal_narrowband_filter5
• direct_horizontal_narrowband_filter4
• direct_horizontal_narrowband_filter3
• direct_horizontal_narrowband_filter2
• direct_horizontal_narrowband_filter1
• Radiation, shortwave, diffuse hemispheric irradiance, 415 nm wavelength (diffuse_hemisp_narrowband_filter1)
• Radiation, shortwave, diffuse hemispheric irradiance, 615 nm wavelength (diffuse_hemisp_narrowband_filter3)
• Radiation, shortwave, diffuse hemispheric irradiance, 500 nm wavelength (diffuse_hemisp_narrowband_filter2)
• Hemispheric broadband irradiance*(hemisp_broadband)
• Radiation, shortwave, diffuse hemispheric irradiance, 870 nm wavelength(diffuse_hemisp_narrowband_filter5)
• Radiation, shortwave, diffuse hemispheric irradiance, 673 nm wavelength (diffuse_hemisp_narrowband_filter4)
• Radiation, shortwave, diffuse hemispheric irradiance, 940 nm wavelength(diffuse_hemisp_narrowband_filter6)
• diffuse_hemisp_broadband
• Radiation, shortwave, hemispheric irradiance, 415 nm wavelength (hemisp_narrowband_filter1)
• Radiation, shortwave, hemispheric irradiance, 500 nm wavelength(hemisp_narrowband_filter2)
• Radiation, shortwave, hemispheric irradiance, 615 nm wavelength(hemisp_narrowband_filter3)
• Direct Normal Broadband Irradiance, broadband scale applied(direct_normal_broadband)
• Narrowband hemispheric irradiance, filter 4, nominal wavelength is 660 nm*(hemisp_narrowband_filter4)
• Radiation, shortwave, hemispheric irradiance, 940 nm wavelength (hemisp_narrowband_filter6)
• Radiation, shortwave, hemispheric irradiance, 870 nm wavelength(hemisp_narrowband_filter5)
• Direct normal narrowband irradiance, filter 6(direct_normal_narrowband_filter6)
• Direct normal narrowband irradiance, filter 5(direct_normal_narrowband_filter5)
• Radiation, shortwave, direct normal irradiance, 673 nm wavelength(direct_normal_narrowband_filter4)
• Direct normal narrowband irradiance, filter 3(direct_normal_narrowband_filter3)
• Direct normal narrowband irradiance, filter 2(direct_normal_narrowband_filter2)
• Radiation, shortwave, direct normal irradiance, 415 nm wavelength(direct_normal_narrowband_filter1)
• direct_horizontal_broadband