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Learn why PAR values fluctuate with changes in sun zenith angle. Typically, PAR decreases as the angle increases, with a notable 50% drop within an hour. An outlier, potentially caused by cloud cover, can impact data accuracy.
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Why PAR varies? PAR values generally decrease with increased sun zenith angle. During 1-hour, PAR almost drops 50%. There is an outlier (I think), which may be due to cloud.