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Proceedings Paper

U.S.-Russian cooperation in experimental studies to measure polarization of sunlight scattered from clouds and propagation of radiation through clouds
Author(s): John DeVore; A. T. Stair; Thomas Humpherys; Valery Sinelshchikov; Ilya Schiller; Victor Misnik; Vladimir Ivanov; Valery Kirichouk; Valery Abramov; John Watson; Dmitry Chvanov; Victor Privalsky
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Paper Abstract

We describe joint U.S.-Russian Federation (RF) measurements of cloud scattering and polarization using the cloud chamber at Obninsk and field observations at Gorno-Altaysk. Cloud chamber experiments measure polarized scattering patterns of narrow distributions of ice crystals. These experiments may be supplemented with extended-range, intensity-only measurements. The U.S. team uses its scattering codes to verify intensity measurements involving oriented ice crystals, compares the orientation distributions with theory, and may field sensors to measure the total optical depth and the forward scattering properties of the particles in the cloud layer. Ice clouds present two serious impediments to electro-optical observation systems: clutter in short and mid-wave IR bands, and propagation loss when attempting to see through clouds. In high-altitude clouds, ice particles' mirror-like crystalline structure can produce intense "glint" features viewed from satellite sensors. Polarization can mitigate cloud clutter, since cloud-scattered sunlight is generally polarized, whereas point-source target signals are not. The effectiveness of polarization as a mitigant can in principle be modeled, but the models require validation, which must be based on carefully designed laboratory and field experiments.

Paper Details

Date Published: 31 October 2005
PDF: 10 pages
Proc. SPIE 5979, Remote Sensing of Clouds and the Atmosphere X, 597908 (31 October 2005); doi: 10.1117/12.627692
Show Author Affiliations
John DeVore, Visidyne, Inc. (United States)
A. T. Stair, Visidyne, Inc. (United States)
Thomas Humpherys, Utah State Univ. (United States)
Valery Sinelshchikov, TsNPO Kometa (Russia)
Ilya Schiller, Visidyne, Inc. (United States)
Victor Misnik, TsNPO Kometa (Russia)
Vladimir Ivanov, Institute of Experimental Meteorology (Russia)
Valery Kirichouk, Institute of Automation and Electrometry (Russia)
Valery Abramov, Scientific Research Ctr. Astroinform SPE (Russia)
John Watson, The Aerospace Corp. (United States)
Dmitry Chvanov, Utah State Univ. (United States)
Victor Privalsky, Vega International (United States)

Published in SPIE Proceedings Vol. 5979:
Remote Sensing of Clouds and the Atmosphere X
Klaus Schäfer; Adolfo T. Comerón; James R. Slusser; Richard H. Picard; Michel R. Carleer; Nicolaos Sifakis, Editor(s)

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