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danpower101 / crspy

crspy is a python package for the processing and calibration of cosmic-ray neutron sensors
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Flag against MOD or MOD_CORR #2

Closed danpower101 closed 3 years ago

danpower101 commented 4 years ago

When flagging data, currently this is done against raw neutron counts (MOD). This, I believe, follows both COSMOS and CosmOz methods ( http://cosmos.hwr.arizona.edu/Docs/data.txt and https://cosmoz.csiro.au/metadata ).

The N0 term is the maximum theoretical neutron counts (i.e. dry conditions). This is calculated on corrected fast neutron counts (MOD_CORR) to remove impacts from external variables (finten, fawv etc.)

Is it not therefore more correct to flag based on MOD_CORR rather than MOD? Otherwise your comparing N0 (corrected) with N (uncorrected)

danpower101 commented 3 years ago

Have decided that flag 1 (difference between consequtive counting periods greater than 20%) should be applied to raw neutron counts (i.e. MOD)

Flags 2 and 3 (both proportional to N0) should be applied to corrected neutron counts (i.e. MOD_CORR). That way N and N0 are both corrected (theoretically removing external influences on N).