Ambipolar electrostatic field in negatively charged dusty plasma

Hadid, L. Z.Univ Paris Saclay, Lab Phys Plasmas LPP, CNRS, Observ Paris,Sorbonne Univ,Inst Polytech Paris,Ec, F-91120 Palaiseau, France. (author)

We study the effect of negatively charged dust on the magnetic-field-aligned polarisation electrostatic field (E-parallel to) using Cassini's RPWS/LP in situ measurements during the `ring-grazing' orbits. We derive a general expression for E-parallel to and estimate for the first time in situ parallel to E-parallel to parallel to (approximately 10(-5) V m(-1)) near the Janus and Epimetheus rings. We further demonstrate that the presence of the negatively charged dust close to the ring plane (vertical bar Z vertical bar less than or similar to 0.11 R-s) amplifies parallel to E-parallel to parallel to 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 R-s above the ring plane. Furthermore, we discuss the role of the collision terms, in particular the ion-dust drag force, in amplifying E-parallel to. These results imply that the charged dust, as small as nanometres 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.

Shebanits, OlegUppsala universitet,Rymd- och plasmafysik,Institutet för rymdfysik, Uppsalaavdelningen,Imperial Coll London, Blackett Lab, London SW7 2AZ, England.(Swepub:uu)olesh408 (author)
Wahlund, J-ESwedish Inst Space Phys, Box 537, SE-75121 Uppsala, Sweden. (author)
Morooka, MichikoUppsala universitet,Institutionen för fysik och astronomi,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)mimor108 (author)
Nagy, A. F.Univ Michigan, Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA. (author)
Farrell, W. M.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. (author)
Holmberg, M. K. G.ESTEC ESA, NL-2201 AZ Noordwijk, Netherlands. (author)
Modolo, R.LATMOS Lab Atmospheres Milieux Observat Spatiales, F-78280 Guyancourt, France. (author)
Persoon, A. M.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. (author)
Tseng, W. L.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei 11677, Taiwan. (author)
Ye, S-YSouthern Univ Sci & Technol SUSTech, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China. (author)
Univ Paris Saclay, Lab Phys Plasmas LPP, CNRS, Observ Paris,Sorbonne Univ,Inst Polytech Paris,Ec, F-91120 Palaiseau, France.Rymd- och plasmafysik (creator_code:org_t)

By the author/editor: Hadid, L. Z.; Shebanits, Oleg; Wahlund, J-E; Morooka, Michiko; Nagy, A. F.; Farrell, W. M.; show more...; Holmberg, M. K. ...; Modolo, R.; Persoon, A. M.; Tseng, W. L.; Ye, S-Y; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Fusion Plasma an ...

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