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@ARTICLE{Meier:824036,
author = {Meier, Patrick and Motschmann, Uwe and Schmidt, Jürgen and
Spahn, Frank and Hill, Thomas W. and Dong, Yaxue and Jones,
Geraint H. and Kriegel, Hendrik},
title = {{M}odeling the total dust production of {E}nceladus from
stochastic charge equilibrium and simulations},
journal = {Planetary and space science},
volume = {119},
issn = {0032-0633},
address = {Kidlington [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2016-06662},
pages = {208 - 221},
year = {2015},
abstract = {Negatively and positively charged nano-sized ice grains
were detected in the Enceladus plume by the Cassini Plasma
Spectrometer (CAPS). However, no data for uncharged grains,
and thus for the total amount of dust, are available. In
this paper we estimate this population of uncharged grains
based on a model of stochastic charging in thermodynamic
equilibrium and on the assumption of quasi-neutrality in the
plasma-dust system. This estimation is improved upon by
combining simulations of the dust component of the plume and
simulations for the plasma environment into one
self-consistent model. Calibration of this model with CAPS
data provides a total dust production rate of about 12 kg
s−1, including larger dust grains up to a few microns in
size. We find that the fraction of charged grains dominates
over that of the uncharged grains. Moreover, our model
reproduces densities of both negatively and positively
charged nanograins measured by Cassini CAPS. In Enceladus׳
plume ion densities up to View the MathML source~104cm−3
are required by the self-consistent model, resulting in an
electron depletion of about $50\%$ in the plasma, because
electrons are attached to the negatively charged nanograins.
These ion densities correspond to effective ionization rates
of about View the MathML source10−7s−1, which are about
two orders of magnitude higher than expected.},
ddc = {620},
pnm = {899 - ohne Topic (POF3-899) / Plasma and Dust Simulations
on the Saturnian Rings $(hbs06_20111101)$},
pid = {G:(DE-HGF)POF3-899 / $G:(DE-Juel1)hbs06_20111101$},
typ = {PUB:(DE-HGF)16},
doi = {10.1016/j.pss.2015.10.002},
url = {https://juser.fz-juelich.de/record/824036},
}