kth.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Potential structure around th Cassini spacecraft near the orbit of Enceladus
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
Department of Physics and Technology, University of Tromsö, Norway.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
Max-Planck-Institute für Extraterrestrische Physik, Germany.
2010 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 17, no 10Article in journal (Refereed) Published
Abstract [en]

We present the results of numerical simulations of the potential structure around an object in a streaming plasma with parameters relevant for the Cassini spacecraft passing through Saturn's plasma disk near the orbit of Enceladus. Two-and three-dimensional particle-in-cell codes have been used allowing the potential of the simulated spacecraft body to develop self-consistently through the collection of charge by its surface. The dependence of the density and potential profiles on ambient plasma density, electron temperature, and ion drift speed is discussed. The spacecraft floating potential values, found in the simulations, are compared to those deduced from the analysis of Cassini Langmuir probe characteristics.

Place, publisher, year, edition, pages
2010. Vol. 17, no 10
Keywords [en]
plasma interaction, dust particles, simulation
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-12940DOI: 10.1063/1.3486523ISI: 000283772200052Scopus ID: 2-s2.0-78149249277OAI: oai:DiVA.org:kth-12940DiVA, id: diva2:319768
Note
QC 20100519Available from: 2010-05-19 Created: 2010-05-19 Last updated: 2022-06-25Bibliographically approved
In thesis
1. Object-plasma interaction in the vicinity of Enceladus
Open this publication in new window or tab >>Object-plasma interaction in the vicinity of Enceladus
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

    The Cassini spacecraft orbits Saturn since 2004, carrying a multitude of instruments for studies of the plasma environment around the planet as well as the constituents of the ring system. Of particular interest to the present thesis is the large E ring, which consists mainly of water ice grains, smaller than a few micrometres, referred to as dust. The work presented here is concerned with the interaction between, on the one hand, the plasma and, on the other hand, the dust, the spacecraft and the Langmuir probe carried by it. In Paper I, dust densities along the trajectory of Cassini, as it passes through the ring, are inferred from measured electron and ion densities. In Paper II, the situation where a Langmuir probe is located in the potential well of a spacecraft is considered. The importance of knowing the potential structure around the spacecraft and probe is emphasised and its effect on the probe’s current-voltage characteristic is illustrated with a simple analytical model. In Paper III, particle-in-cell simulations are employed to study the potential and density profiles around the Cassini as it travels through the plasma at the orbit of the moon Enceladus.

Abstract [sv]

   Rymdsonden Cassini befinner sig i omloppsbana kring Saturnus sedan 2004 och bär med sig en mångfald av instrument för att studera plasmat och ringarna som omger planeten. Av särskilt intresse i denna licentiatuppsats är den stora E-ringen. Denna utgörs huvudsakligen av mikrometerstora (eller mindre) dammpartiklar, bestående av is. Det arbete som presenteras här behandlar interaktion mellan, å ena sidan, plasmat och, å andra sidan, dammet, rymdsonden och Langmuirprob som denna är utrustad med. I den bilagda Paper I utvinns dammtätheter längs Cassinis bana genom E-ringen ur mätta elektron- och jontätheter. I Paper II betraktas situationen där en Langmuirprob befinner sig i potentialgropen som omger en rymdsond. Här betonas vikten av att ta hänsyn till potentialstrukturen kring rymdsond och prob, och en enkel analytisk modell används för att illustrera hur probens ström-spänningskaraktäristik kan påverkas av denna potentialstruktur. I Paper III studeras täthets- och potentialprofilerna runt Cassini numeriskt med particle-in-cellsimuleringar för parametrar som modellerar hur rymdsonden rör sig relativt plasmat vid månen Enceladus bana.

 

Publisher
p. xi, 34
Series
Trita-EE, ISSN 1653-5146
Identifiers
urn:nbn:se:kth:diva-12941 (URN)978-91-7415-673-7 (ISBN)
Presentation
2010-06-04, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100519Available from: 2010-05-19 Created: 2010-05-19 Last updated: 2022-06-25Bibliographically approved
2. Plasma and dust interaction in the magnetosphere of Saturn
Open this publication in new window or tab >>Plasma and dust interaction in the magnetosphere of Saturn
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Cassini spacecraft orbits Saturn since 2004, carrying a multitude of instruments for studies of the plasma environment around the planet as well as the constituents of the ring system. Of particular interest to the present thesis is the large E ring, which consists mainly of water ice grains, smaller than a few micrometres, referred to as dust. The first part of the work presented here is concerned with the interaction between, on the one hand, the plasma and, on the other hand, the dust, the spacecraft and the Langmuir probe carried by the spacecraft. In Paper I, dust densities along the trajectory of Cassini, as it passes through the ring, are inferred from measured electron and ion densities. In Paper II, the situation where a Langmuir probe is located in the potential well of a spacecraft is considered. The importance of knowing the potential structure around the spacecraft and probe is emphasised and its effect on the probe's current-voltage characteristic is illustrated with a simple analytical model. In Paper III, particle-in-cell simulations are employed to study the potential and density profiles around the Cassini as it travels through the plasma at the orbit of the moon Enceladus. The latter part of the work concerns large-scale currents and convection patterns. In Paper IV, the effects of charged E-ring dust moving across the magnetic field is studied, for example in terms of what field-aligned currents it sets up, which compared to corresponding plasma currents. In Paper V, a model for the convection of the magnetospheric plasma is proposed that recreates the co-rotating density asymmetry of the plasma.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. p. xiii, 40
Series
Trita-EE, ISSN 1653-5146 ; 2012:018
Keywords
saturn, dusty plasma
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-93983 (URN)978-91-7501-343-5 (ISBN)
Public defence
2012-05-28, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120507Available from: 2012-05-07 Created: 2012-05-03 Last updated: 2022-06-24Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Ratynskaia, Svetlana

Search in DiVA

By author/editor
Olson, JonasRatynskaia, Svetlana
By organisation
Space and Plasma Physics
In the same journal
Physics of Plasmas
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 167 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf