This data set is composed of in-situ measurement of arctic cloud microphysical properties (particle size distribution and volumic cloud particle diffusion properties) observed during the AFLUX-AC3 campaign, which occurred between 19 March and 11 April 2019. These measurements were made using the 2D stereoscopic (2D-S, SPEC Inc.) and Polar Nephelometer (Gayet et al., 1997) probes from the airborne measurement platform of the Laboratoire de Météorologie Physique (CNRS/UCA, Aubière, France). There is one file per flight. All files are in NetCDF format, with a complete description of the parameters inside. A detailed list of the parameters present in the data set is added in a separate document.

Every file with nc extension is a data set in NetCDF format, with the DBdescription.pdf describing all parameters included.There is one file per flight.CAUTION : this dataset was made using the 2D-S probe and thus has two set of similar measurement for the horizontal and vertical sampling photodiode array. This can be confusing, and the authors recommend using only the horizontal sampling data set if the users are unsure. Mixing or using both sampling lines are up to the user proficiency with this data.