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AEROSOL OPTICAL DEPTH AEROSOL INVERSIONS SOLAR FLUX OCEAN COLOR Maritime Aerosol Network
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Aerosol Robotic Network (AERONET)
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AERONET Instrument Troubleshooting Interface - Solutions for A AND K DISCREPANCY Flag

Condition(s)
Instruments with Silicon Detectors Only: Estimate A and K from PP and almucantars measurements when Level 1.5 AOT data are available. Do not flag if at least in 2 instances for 440nm channel of A are within 10% from K.

How To Check/Test
See collimator cleaning (PDF, JPG).

Solution Level 1 (< 5 minutes)
1. Remove collimator and check inside for webs or other obstructions.
2. Ensure collimator is installed in the correct orientation.

Solution Level 2 (more involved)
1. Inspect the lenses for significant contamination or residue. If found, do not clean. Take a picture and send to AERONET.

Solution Level 3 (last resort)
1. Confirm that the gains have not been changed (ask AERONET) - Model 5 only.
2. Return instrument for maintenance.

Collimator cleaning procedure
Collimator cleaning procedure
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Last Updated: April 18, 2026