Light scattering by horizontally oriented ice crystal plates

Borovoi, Anatoli G.; Burnashov, A. V.; Cheng, A.

doi:10.1016/j.jqsrt.2007.01.002

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…Theoretical investigations of halo characteristics using geometrical optics [3,[16][17][18][19][20][21] can be done using any of the freely available halo simulation tools. HaloSim [22] for instance allows the refractive index to be set, and choosing a 3-6 user defined fisheye perspective centering on the zenith allows simulation of the entire sky, including the full PHC.…”

Section: Ray Optics and Intensitiesmentioning

confidence: 99%

Intensity distribution of the parhelic circle and embedded parhelia at zero solar elevation: theory and experiments

Borchardt

Selmke

2015

Appl. Opt.

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We describe the individual contributions to the intensity distribution of the parhelic circle for plate-oriented hexagonal crystals at exactly zero solar elevation using geometrical optics. An experimental as well as theoretical study of in-plane ray paths provides details on the mechanism for several halos, including the parhelia, the 120° and 90° parhelia, a blue edge, and the Liljequist parhelia. Azimuthal coordinates for associated characteristic features in the intensity distribution are compared with experimental data obtained using a spinning hexagonal glass prism.

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Section: Ray Optics and Intensitiesmentioning

confidence: 99%

Intensity distribution of the parhelic circle and embedded parhelia at zero solar elevation: theory and experiments

Borchardt

Selmke

2015

Appl. Opt.

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“…Their single scattering properties play an important role in remote sensing in visible and infrared light as well as in microwaves [11]. Light scattering properties of ice crystals have been typically calculated in the geometric optics (GO) approximation by ray-tracing algorithms [8,[12][13][14][15][16][17]. When crystal dimensions are comparable to the incident wavelength λ , diffractive effects have been estimated using circular cylinders [18,19] and combinations of several techniques [6,20].…”

Section: Ice Crystalsmentioning

confidence: 99%

Light scattering by hexagonal columns in the discrete dipole approximation

Flatau

Draine

2014

Opt. Express

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Scattering by infinite hexagonal ice prisms is calculated using Maxwell's equations in the discrete dipole approximation for size parameters x = πD/λ up to x = 400 (D = prism diameter). Birefringence is included in the calculations. Applicability of the geometric optics approximation is investigated. Excellent agreement between wave optics and geometric optics is observed for large size parameter in the outer part of the 22 degree halo feature. For smaller ice crystals halo broadening is predicted, and there is appreciable "spillover" of the halo into shadow scattering angles < 22 degrees. Ways to retrieve ice crystal sizes are suggested based on the full width at half-maximum of the halo, the power at < 22deg, and the halo polarization.

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