Behavior of 2D Turbulence Spectra at Long Wavelengths in Relation to Perpendicular Particle Transport

Much past work on perpendicular particle transport in 2D magnetic turbulence has employed a model 2D spectrum with somewhat pathological characteristics such as an infinite correlation scale. Here we consider how the behavior of the spectrum at long wavelengths influences the perpendicular diffusion coefficient, by using spectrum models ranging from the somewhat pathological one commonly used in the past, to completely well behaved models consistent with strictly homogeneous turbulence. We also compare the predicted diffusion coefficients with key observational constraints, in the hope that the observations can provide insight into the correct form of the spectrum in the solar wind. Research supported in part by the NASA Heliophysics theory program NNX08AI47G, LWS program NNX07AH73G, and NSF SHINE ATM0752135.