Data Handling

The pulses produced by particles are counted, and standard RAF processing software ("nimbus") records the number counted in the sample-time interval (typically 1 s) and uses the measured flow (with pressure and temperature as measured in the sample cavity) to determine the concentration. The primary output variable is typically the ambient CN concentration "CONCN", and other variables typically associated with the water-based CN counter include measurements of the internal pressure and temperature as well as some ancillary variables like the temperature of the saturator and of the growth tube and optical components. Measurements are included in the archived standard netCDF data files. Note that, unlike some other groups, RAF output variables are in ambient concentration, not standard reference concentration. For further information see this page: StandardDataPath