Universität zu Köln

Kriegel, Hendrik, Simon, Sven ORCID: 0000-0002-6204-5437, Meier, Patrick, Motschmann, Uwe, Saur, Joachim ORCID: 0000-0003-1413-1231, Wennmacher, Alexandre, Strobel, Darrell F. and Dougherty, Michele K. (2014). Ion densities and magnetic signatures of dust pickup at Enceladus. J. Geophys. Res-Space Phys., 119 (4). S. 2740 - 2775. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9402

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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 Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kriegel, Hendrik UNSPECIFIED UNSPECIFIED UNSPECIFIED Simon, Sven UNSPECIFIED orcid.org/0000-0002-6204-5437 UNSPECIFIED Meier, Patrick UNSPECIFIED UNSPECIFIED UNSPECIFIED Motschmann, Uwe UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, Joachim UNSPECIFIED orcid.org/0000-0003-1413-1231 UNSPECIFIED Wennmacher, Alexandre UNSPECIFIED UNSPECIFIED UNSPECIFIED Strobel, Darrell F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dougherty, Michele K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-442600
DOI:	10.1002/2013JA019440
Journal or Publication Title:	J. Geophys. Res-Space Phys.
Volume:	119
Number:	4
Page Range:	S. 2740 - 2775
Date:	2014
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9402
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CROSS-SECTIONS; WATER; PLUME; PLASMA; ATMOSPHERE; COLLISIONS; JETS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44260