Perpendicular Diffusion of Solar Energetic Particles

We present new observations which demonstrate an energy dependence in energetic particle diffusion perpendicular to the average magnetic field direction. Dispersionless energetic particle flux "dropouts" represent small scale gradients, and, by examining how particles move off field lines containing particle flux and onto the dropout field lines without particle flux, we can measure the relative diffusion. As expected, the perpendicular energetic particle diffusion coefficient is determined to be larger at higher energies than lower energies.