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Figure 6: Flight tracks during SPECTRA 1 for which CCN data are available. <br />3.3 Data analysis methodology <br />3.3.1 CCN and cloud physics data <br />The DAQFactory aircraft data system (see Appendix A) acquires and logs data from the CIP, CDP, <br />AIMMS-20 and the PCASP. The CCN counter has an onboard Lab VIEW data system. This data is saved <br />in individual files and retrieved after each flight. Post processing of the aircraft data starts with systematic <br />checks for errors in each data file, synchronizing all the data files, performing calculations, and creating a <br />collective data file for further analysis. The collective data file is of an ASCII format and includes all the <br />fields defined in table 2 above. Once all the data fields are synchronized in one file, several plots are <br />created to ensure that the data is within thresholds that are physically conceivable. This process was <br />usually conducted immediately after each flight. <br />After the SPECTRA 1 field campaign came to an end, several other plots were created to investigate the <br />relationship of certain key microphysical properties. A group of plots was first created and distributed <br />amongst the PIs, and discussions then followed on how the plots could be improved. The final process of <br />the analysis was to decide on a small set of informative plots that best describe the microphysical <br />th <br />properties of the convective clouds. As an example, a set of plots from 19 August 2004 is presented in <br />figure 7 below accompanied by a comprehensive explanation to describe how the plots were created. <br />27 <br />