The reflection of charged particles by rotational discontinuities

This paper investigates the reflection and transmission of charged particles incident on a rotational discontinuity whose thickness is small compared to their Larmor radius. This is done for the full range of parameters likely to occur for rotational discontinuities in the solar wind. Usually the proportion of particles reflected is similar to that predicted by adiabatic theory, except when the magnetic field ratio is close to unity, or the bend in the fieldlines is large.