The Millimeter Wave Cloud Radar (MMCR) is a remote sensing instrument that transmits a radar pulse directly overhead to determine the tops and bottoms of clouds. It can also serve as a type of Doppler radar in measuring up and down particle movements within a cloud. Values that the radar measures are doppler velocity[?], radar reflectivity[?], and spectral width.
... to a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,3 ...