The published data set consists of measurements performed by the active cloud radar as part of the MiRAC (Microwave Radar and radiometer for Arctic Clouds) operated on board the Polar 5 research aircraft during 19 flights of the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign, carried out in early summer 2017 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of radar reflectivities of the FMCW 94 GHz cloud radar transformed to nadir view as well as brightness temperature measurements at 89 GHz with a 25 deg backwards inclination with respect to the aircraft fuselage The data set has been quality checked and is available in netcdf format for each flight separately.Details on the instrument can be found in Mech et al. (2019) (doi:10.5194/amt-12-5019-2019)

The files contain radar reflectivities, brightness temperatures, measurement times, flags for the filters applied and some key numbers of the operated instrument. In addition meta information and attributes are provided. The files are in netcdf format following CF-1.8.---This is an old version, please refer to the new version (see "replace by" reference).