Atmospheric Optics and Light Scattering

Introduction

Light interacting with cloud drops and ice crystals in the atmosphere produces atmsopheric optics dsiplayes - rainbows, halos, glories, coronas. Observation of these phenomena give hints about properties of cloud drops, raindrops, and ice crystals - their sizes and orientations.

One of the best atmospheric optics sites is
http://www.atoptics.co.uk/

Simulate atmospheric optics phenomena - HaloSim3 and Iris2 Software

HaloSim runs on PCs with Windows95+. A 24 bit color is desirable. Memory and hard disk requirements are insignificant. The download comes with all data and a set of ready-to-run simulations.

(1) DOWNLOAD "halosim361.zip" from http://www.atoptics.co.uk/halo/downld.htm (2.38 MB) or /files/halosim361.zip
(2) EXTRACT (do not RUN) into a temporary folder.
(3) RUN 'setup.exe'. When prompted chose a folder for the program files or use the suggested default which is usually inside c:\Program Files\….
(4) RUN 'HaloSim361.exe' from the program files folder.

Iris2 software

(1) Download 'iris2.zip' here http://www.atoptics.co.uk/droplets/dload.htm or /files/iris2.zip
(2) EXTRACT into a temporary folder
(3) RUN 'setup.exe'. When prompted chose a folder for the program or use the suggested default.
(4) RUN 'Iris.exe'

Mie scattering

Mie scattering http://www.philiplaven.com/mieplot.htm

Discrete Dipole Approximation

DDSCAT code (discrete dipole approximation)
http://www.astro.princeton.edu/~draine/DDSCAT.html

User Guide to the Discrete Dipole Approximation Code DDSCAT.7.0", by B.T. Draine and Piotr J. Flatau. A copy of this document (postscript or pdf) can be obtained from http://arxiv.org/abs/0809.0337

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