Top: dependence of the equilibrium surface potential φd(a) on grain radius a. Materials are NaCl (i); (ii) and silicate (iii); (iv) immersed in typical plasma conditions expected at r ~ 5.7RJ distance in the Jupiter system (see text). The results (i) and (iii) are obtained from the generalized Js model (7) and compared to results (ii) and (iv) using the Sternglass approximation for SEE . Bottom, left: dependence of the charge-to-mass ratio q/m on grain radius a for NaCl grains corresponding to the results (i) and (ii) in Fig. 3 (top). Bottom, right: zoom for small | q/m | emphasizing the existence of a size range where the new SEE model leads to a different polarity of the grains.
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