Biomedical subjects

Jan O Mattsson

Publications and source records attributed to Jan O Mattsson.

2 recordsLinked to original sources

PubMed2005

Improved algorithm for simulations of divergent-light halos.

Divergent-light halos are produced when light from nearby light sources is scattered by ice crystals in the atmosphere. We present a theory of divergent-light halos leading to an improved algorithm for the simulation of such halos. Contrary to the algorithm that we presented earlier for simulating such halos, the new algorithm includes a mathematically rigorous weighting of the events. The computer implementation is very compact, and the whole procedure is elegant and conceptually easy to understand. We also present a new simulation atlas showing halos produced by crystals of different shapes and orientations for a set of elevations of the light source.

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PubMed2003

Observations and simulations of some divergent-light halos.

We deal with some halos generated by the divergent light from a nearby source. After discussing how the divergent light transforms some halo features, we give an outline of a method of handling the simulation of a divergent-light halo. The simulation method is then successfully tested on some well-documented halo observations. We also present a "simulation atlas" that shows halos produced by crystals of different shapes and for different light-source elevations and distances between the observer and the light source. The simulation method also admits a three-dimensional visualization ofthe phenomena.

Journal Article↗