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Ambipolar electrostatic field in dusty plasma
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In the paper published by L. Z. Hadid et al. JPP, 2022, the authors investigated the effect of the negatively charged nanometer-sized grains on the magnetic-field-aligned polarization electrostatic field (E||) using Cassini’s Langmuir Probe data during the ‘ring-grazing’ orbits. They derived a general expression of E|| and estimated for the first time in-situ E|| near Janus and Epimetheus rings. They also demonstrated that the presence of the negatively charged dust close to the ring plane amplifies E|| by at least one order of magnitude and reverses its direction due to the effect of the charged dust gravitational and inertial forces. Such reversal confines the electrons at the magnetic equator within the dusty region, around 0.047 Rs ( 2830 km) above the ring plane. These results imply that the charged dust, as small as nanometers in size, can have a significant influence on the plasma transport, in particular ambipolar diffusion along the magnetic field lines, and so their presence must be taken into account when studying such dynamical processes.
Contact at LPP : Lina Hadid
View online : L. Z. Hadid et al., Journal of Plasma Physics, 2022, doi:10.1017/S0022377822000186
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