The charge of fluffy dust grains of silicate and carbon near P/Halley and P/Giacobini-Zinner

Physics

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Carbon, Cosmic Dust, Electric Charge, Electric Potential, Giacobini-Zinner Comet, Halley'S Comet, Silicates, Giotto Mission, International Sun Earth Explorer 3, Plasma Potentials

Scientific paper

The equilibrium potentials of spherical dust grains of silicate and carbon in the coma of P/Halley and P/Giacobini-Zinner is modelled numerically using the in-situ measurements of the plasma experiments flown aboard the Giotto and ICE spacecrafts. For both comets silicates are found to carry positive potentials (+7 to +10 V); carbonic grains are positively charged near P/Halley (+6 to +3 V), but show repeated changes of their signs in the plasma environment of P/Giacobini-Zinner (+6 to -18 V). The times for charging range up to several thousand seconds. Only very weak grains (στ = 103 to 104dyn cm-2) with ⪉1 μm radii can fragmentate in the comae of the comets considered.

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