Fig. 1
Left: parallel and perpendicular scattering mean free paths for 10 MeV protons obtained with Eqs. (2)–(4) and λ⊥ = 3κ⊥/v. Right: diffusion coefficient ratios. For the red curve, the cross-field diffusion coefficient is obtained as κ⊥ = vDFL, representing a cross-field diffusion coefficient that is due to field-line meandering of unscattered particles.
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