HR: 0800h
AN: A41B-0432    [Abstracts]
TI: Scattering properties of horizontally oriented hexagonal plates
AU: * zhang, f
EM: smalltalk@tamu.edu
AF: Department of Atmospheric Science, Department of Atmospheric Science, Texas A&M University, College station, tx 77843,
AU: Yang, P
EM: pyang@ariel.met.tamu.edu
AF: Department of Atmospheric Science, Department of Atmospheric Science, Texas A&M University, College station, tx 77843,
AU: Kattawar, G
EM: kattawar@physics.tamu.edu
AF: Department of Physics, Department of Physics, Texas A&M University, College station, tx 77843,
AU: hu, Y
EM: yongxiang.hu-1@nasa.gov
AF: NASA Langley Research Center, NASA Langley Research Center, Hampton, VA 23681,
AB: Some ice crystals (ice plates, in particular) may be quasi-horizontally oriented in the atmosphere. For the backscattering of such oriented nonspherical particles, the conventional ray-tracing method is not applicable because the phase function derived from the ray-tracing calculation in this case is just the superposition of the diffraction contribution and two delta functions. For the scattering particles involved in this study, the applicability of rigorous methods such as the T-Matrix, DDA, FDTD/PSTD methods are also limited because the typical sizes of ice crystals are a few hundred microns and the corresponding size parameters are too big for these methods. To illustrate the inapplicability of the conventional ray-tracing method to the scattering of light by horizontally oriented ice plates, we derive the internal scattered-field inside these particles on the basis of the electromagnetic wave theory by ignoring the effect of side faces, which is then used to derive the phase matrix. It is shown that the phase function derived from the electromagnetic wave theory is quite different from the counterpart from the ray-tracing method.
DE: 0319 Cloud optics
DE: 0320 Cloud physics and chemistry
DE: 3311 Clouds and aerosols
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting