WP-3D Cloud Physics
The primary cloud physics instruments on the WP-3D are the 2D-C (0.005 mm resolution) and 2D-P (0.15 mm resolution) PMS probes for sampling the sizes of raindrops and ice crystals. The data from the 2D-imaging probes were recorded on 9-track tapes prior to 1992 and on DAT since 1992. Small ice columns are detected directly on a FORMVAR replicator. Cloud water is measured by both JW and King Probes.
Electric fields are measured by 4 shutter type mills mounted normal to the aircraft skin, up, down, left, and right. The horizontal mills are symmetrically mounted about midway between the door and the trailing edge of the wings. The vertical mills are mounted near the trailing edge of the wings, but their vertical location differs by 0.6 m and the top mill is mounted on a 0.3 m aluminum pylon. Relative enhancements were measured by charging the aircraft in cloud-free flight.
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