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Scattering and absorption by nonspherical particles in planetary atmospheres

Show simple item record West, Robert A. 2007-09-21T18:54:47Z 2007-09-21T18:54:47Z 2005-05-16
dc.identifier.citation IAA 8th Conference On Electromagnetic and Light Scattering By Nonspherical Particles, Salobreña, Spain, May 16-20-2005 en
dc.identifier.clearanceno 05-0538
dc.description.abstract The atmospheres of Mars, the giant planets, and Titan all support populations of nonspherical particles. Analyses of observations of these atmospheres therefore rely on an understanding of the optical properties of nonspherical particles. We can glean information on particle size and composition from the wavelength dependence of the optical depth and from the shape of the forward peak of the scattering phase function. Additional information comes from polarization measurements which have been especially fruitful for Titan's haze. The Mars atmosphere contains mineral dust particles with effective radii near 1.6 micro meters, and water ice particles with radii between about 1 and 4 micro meters. The uppermost tropospheric hazes in Jupiter and Saturn are composed of ice crystals of ammonia, water and possibly traces of ammonium hydrosulfide, Methane ice and hydrogen sulfide ice are present in the atmospheres of Uranus and Neptune. Size estimation for these hazes in the giant planets is difficult, and even the expected spectral signatures are elusive, Titan's haze is both forward scattering and strongly polarized - a combination which points toward a fractal aggregate struc1.ure of 10 - 100 or more organic monomers whose radius is about 0.06 micro meters. Polar stratospheric hazes on Jupiter and Saturn also display this characteristic. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 777759 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2005 en
dc.subject nonsperical particles en
dc.subject planetary atmospheres en
dc.title Scattering and absorption by nonspherical particles in planetary atmospheres en
dc.type Preprint en

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