Top: SEE yield from a NaCl grain for isotropic incidence of electrons, using typical plasma parameters for the Jovian system (see text). Grains of different radii are considered: (i) a = 0.004 μm, (ii) a = 0.01 μm, (iii) a = 0.1 μm, and (iv) 5 μm, the latter corresponding to the limit of big radius x/a → 0. Bottom: dependence of SEE yield from NaCl grains on the grain radius for various primary electron energies. On both figures the SEE yield δ(E0,a,θ = 0) induced by electrons normally incident to the grain surface is shown for comparison (Chow et al. 1993).