The file coulog.for in this directory calculates the effective Coulomb logarithm that appears in the collision operator for plasmas. It is a generalization of the recipe in the NRL formulary to include the effects of strong magnetic fields or the increase in the effective log(Lambda) for energetic particles moving faster than the thermal electrons. In most cases these corrections are relatively small. See the comments in the code for more details and warnings about uncertainties in some regimes.
Orginally written by Greg Hammett, 16-May-1989 to 1991, with updated comments in 2016.