# Henyey-greenstein phase function

From AMS Glossary

## Henyey–Greenstein phase function

A single-parameter analytic form for an anisotropic, scattering phase function.

The Henyey–Greenstein phase function is written as where θ is the scattering angle. The parameter

*g*is conveniently equal to the asymmetry factor. Henyey, L. G., and J. L. Greenstein 1941. Astrophys. J.. 93. p.70.