Magnetic field models from energetic particle data at Neptune

The locations of features in the Voyager 2 energetic particle data from Neptune are combined with uncertainties n the multipole expansion f the planetary magnetic field to derive new magnetic field models that are consistent both with various interpretations of the particle features and with the magnetic field data. While assumptions as to the origin of the features must be made, they do not provide sufficient constraints to obtain significant ew information any of the unknown multipole coefficients. However, the magnetic L shell positions of the particle f atures, which are interpreted primarily as absorption signatures of Neptune's satellites, can, in general, be brought into agreement with expected values.