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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 11
Ann. Geophys., 14, 1192–1197, 1996
https://doi.org/10.1007/s00585-996-1192-2
© European Geosciences Union 1996
Ann. Geophys., 14, 1192–1197, 1996
https://doi.org/10.1007/s00585-996-1192-2
© European Geosciences Union 1996

  30 Nov 1996

30 Nov 1996

Pyramidal ice crystal scattering phase functions and concentric halos

C. Liu, P. R. Jonas, and C. P. R. Saunders C. Liu et al.
  • Department of Pure and Applied Physics, UMIST, PO Box 88, Manchester M60 1QD, UK

Abstract. Phase functions have been calculated using the Monte Carlo/geometric ray tracing method for single hexagonal pyramidal ice crystals (such as solid and hollow bullets) randomly oriented in space and horizontal plane, in order to study the concentric halo formations. Results from three dimensional model calculations show that 9° halo can be as bright as the common 22° halo for pyramidal angle of 28°, and the 18°, 20°, 24° and 35° halos cannot be seen due to the strong 22° halo domination in the scattering phase function between 18° and 35°. For solid pyramidal ice crystals randomly oriented horizontally, the 35° arc can be produced and its intensity depends on the incident ray solar angle and the particle aspect ratio.

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