NSA/QCRAD/C1/C2  - error in qc flags

In the qc_down_short_diffuse_hemisp field, QC failures from the test indicated by bit_13, 
"data failed tracker off test", were set incorrectly as bit_9, "GSW2SumSW (93 > SZA > 75 
and SumSW > 50; GSW/SumSW < 0.85 or GSW/SumSW > 1.15)".  Solar tracker failures are 
correctly indicated in the aqc_down_short_diffuse_hemisp field. 

In the qc_short_direct_normal field, QC failures from the test indicated by bit_10, "data 
failed tracker off test", were set incorrectly as bit_9, "GSW2SumSW (93 > SZA > 75 and 
SumSW > 50; GSW/ SumSW < 0.85 or GSW/SumSW > 1.15)".  Solar tracker failures are correctly 
indicated in the aqc_short_direct_normal field. 

This is a software problem in the VAP that impacts all dates for which a solar tracker 
failure occurred prior to 20100608 for each facility.  The 19990821 start date was chosen 
because the DQR system can not link multiple start/end date/times with multiple facilities 
within the same report.  As a result, the latest start date corresponding to C2 was 
chosen. The actual start dates for which this problem could have occurred for each facility 
are as follows:

C1:  19980215
C2:  19990821

Please note that if a solar tracker failure is not indicated by the 
aqc_down_short_diffuse_hemisp and/or aqc_short_direct_normal fields you can ignore this DQR.

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

NSA/QCRAD/C1 - Incorrect value of solar zenith angle

A missing lat/lon value in the SKYRAD input file on 8/26/04 led to incorrect calculation 
of solar zenith angle in the 9/2/04 QCRAD file (QCRAD reads in a week of data at a time 
and uses lat/lon from the first file).  

The solar zenith angles in this file are all incorrect.  The radiation data are likely 
fine, but many of the tests on the shortwave fluxes use solar zenith angle and therefore the 
qc and aqc fields may be incorrect and may incorrectly flag the shortwave flux data.  

The longwave data should be unaffected.

• zenith
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• lon
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• source_BestEstimate_down_short_hemisp
• lat

• aqc_GSW2SumSW
• source_BestEstimate_down_short_hemisp
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• aqc_down_short_diffuse_hemisp
• aqc_short_direct_normal
• aqc_down_short_hemisp
• lon
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• aqc_DifSW2GSW
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• lat
• zenith
• aqc_SWupTest
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)