The NASA Global Hydrology Resource Center (GHRC) DAAC published the GPM Ground Validation Microwave Atmospheric Sounder on Cubesat (MASC) OLYMPEX dataset (http://dx.doi.org/10.5067/GPMGV/OLYMPEX/MASC/DATA101).
This dataset consists of microwave radiance measurements collected during the GPM Ground Validation Olympic Mountains Experiment (OLYMPEX) field campaign held in the Pacific Northwest. These data were collected by the MASC aboard the NASA DC-8 aircraft, for dates between November 10, 2016 and December 13, 2016. The data are provided in HDF-EOS5 format.
Image source: https://cpex.jpl.nasa.gov/instruments/masc.php