NSA/MFR10M/C1 - Instrument rotated skyward to check calibration

On 19990609 at about 16:10 LST the instrument was flipped upside down so that it was 
pointed directly at the zenith to assess the calibration stability of the both the MFR10m and 
the MFRSR.

This test revealed agreement between the two instruments that ranged from 0.5 to 2.5%, 
depending on the wavelength channel under consideration. The average "error" is 1.5%.  This 
is reasonably good agreement between the two instruments, and there is no evidence of 
gross calibration problems.

The test ended on 19990610 at about 11:30 LST, at which time the MFR10m
was positioned to point towards the ground.

Do not use data during this period.

• Fields flagged by callang: 0 = No Flag ,(callang_flags)
• 3 meter upwelling narrowband hemispheric irradiance, filter 3, offset corrected(up_hemisp_narrowband_filter3)
• 3 meter upwelling narrowband hemispheric irradiance, filter 2, offset corrected(up_hemisp_narrowband_filter2)
• 10 meter upwelling narrowband hemispheric irradiance, filter 1(up_hemisp_narrowband_filter1)
• Cosine solar zenith angle(cosine_solar_zenith_angle)
• 3 meter upwelling broadband hemispheric irradiance(up_hemisp_broadband)
• 10 meter Narrowband Upwelling Hemispheric Irradiance, Filter 6(up_hemisp_narrowband_filter6)
• 25 meter upwelling narrowband hemispheric irradiance, filter 5, offset corrected(up_hemisp_narrowband_filter5)
• 3 meter upwelling narrowband hemispheric irradiance, filter 4(up_hemisp_narrowband_filter4)

• 10 meter Narrowband Upwelling Hemispheric Irradiance, Filter 6(up_hemisp_narrowband_filter6)
• 3 meter upwelling narrowband hemispheric irradiance, filter 4(up_hemisp_narrowband_filter4)
• 25 meter upwelling narrowband hemispheric irradiance, filter 5, offset corrected(up_hemisp_narrowband_filter5)
• 3 meter upwelling broadband hemispheric irradiance(up_hemisp_broadband)
• 3 meter upwelling narrowband hemispheric irradiance, filter 2, offset corrected(up_hemisp_narrowband_filter2)
• 3 meter upwelling narrowband hemispheric irradiance, filter 3, offset corrected(up_hemisp_narrowband_filter3)
• 10 meter upwelling narrowband hemispheric irradiance, filter 1(up_hemisp_narrowband_filter1)
• Fields flagged by callang: 0 = No Flag ,(callang_flags)