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Ion densities and magnetic signatures of dust pickup at Enceladus

Kriegel, H. and Simon, S. and Meier, P. and Motschmann, U. and Saur, J. and Wennmacher, A. and Strobel, D. F. and Dougherty, M. K. (2014) Ion densities and magnetic signatures of dust pickup at Enceladus. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 119 (4), pp. 2740-2774. Wiley. DOI: 10.1002/2013JA019440 ISSN 2169-9380

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Abstract

Encedalus' plume of charged dust has been shown to strongly modify the plasma structures. Therefore, we analyze the magnetic signatures of dust to constrain the dust plume. For the first time, the mutual feedback between the nanograins and their plasma environment is investigated. Our model combines plasma simulations by means of the A.I.K.E.F. (Adaptive Ion-Kinetic Electron-Fluid) code with Monte Carlo simulations of the 3-D profiles of the gas and dust plumes. Data from several instruments of Cassini are considered: the neutral plume model is in good agreement with INMS data, whereas theoretical predictions of the peak ion density are compared against CAPS data, and properties of the dust are obtained by comparing our results with MAG data from the recent E14–E19 flybys. Our main results are (1) due to the ion-neutral chemistry, H3O+ is the predominant ion species within the plume; (2) the high nanograin densities observed by CAPS require an increased effective ionization frequency to fulfill quasi-neutrality; (3) the nanograin pickup current makes only a minor contribution to the current systems; i.e., the major contribution of the dust arises from electron absorption; (4) the pickup of nanograins is clearly visible in the magnetic field signatures, even including the distant encounter E15; (5) MAG data indicate a southward extension of the charged dust plume of at least 4 Enceladus radii; (6) the modification of the currents by the nanograins is responsible for the surprising fact that Cassini did not detect a region with a reduced magnetic field strength.

Item URL in elib:https://elib.dlr.de/92056/
Document Type:Article
Title:Ion densities and magnetic signatures of dust pickup at Enceladus
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kriegel, H.Institut für Theoretische Physik der Technischen Universität Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig, GermanyUNSPECIFIED
Simon, S.Institute of Geophysics and Meteorology, University of Cologne, GermanyUNSPECIFIED
Meier, P.Institute for Theoretical Physics, TU Braunschweig, Braunschweig, GermanyUNSPECIFIED
Motschmann, U.Institut für Theoretische Physik, Technische Universität Braunschweig; uwe.motschmann (at) dlr.deUNSPECIFIED
Saur, J.Institute of Geophysics and Meteorology, University of Cologne, Cologne, GermanyUNSPECIFIED
Wennmacher, A.Institute of Geophysics and Meteorology, University of Cologne, Cologne, GermanyUNSPECIFIED
Strobel, D. F.The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USAUNSPECIFIED
Dougherty, M. K.Imperial College, LondonUNSPECIFIED
Date:2014
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:119
DOI :10.1002/2013JA019440
Page Range:pp. 2740-2774
Publisher:Wiley
ISSN:2169-9380
Status:Published
Keywords:Enceladus; Hybrid; simulation; Cassini; MAG data; Dust
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Brumm, Laura-Maria
Deposited On:19 Nov 2014 09:08
Last Modified:08 Mar 2018 18:35

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