title: Geometrical-optics solution to light scattering by droxtal ice crystals.
abstract: We investigate the phase matrices of droxtals at wavelengths of 0.66 and 11 microm by using an improved geometrical-optics method. An efficient method is developed to specify the incident rays and the corresponding impinging points on the particle surface necessary to initialize the ray-tracing computations. At the 0.66-microm wavelength, the optical properties of droxtals are different from those of hexagonal ice crystals. At the 11-microm wavelength, the phase functions for droxtals are essentially featureless because of strong absorption within the particles, except for ripple structures that are caused by the phase interference of the diffracted wave.
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: Zhibo
authors.initials: Z
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Yang
authors.forename: George W
authors.initials: GW
authors.lastname: Kattawar
authors.forename: Si-Chee
authors.initials: SC
authors.lastname: Tsay
authors.forename: Bryan A
authors.initials: BA
authors.lastname: Baum
authors.forename: Yongxiang
authors.initials: Y
authors.lastname: Hu
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Heymsfield
authors.forename: Jens
authors.initials: J
authors.lastname: Reichardt