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
Europa's plasma interaction with an inhomogeneous atmosphere: Development of Alfvén winglets within the Alfvén wings
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0003-0554-4691
2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 10, p. 9794-9828Article in journal (Refereed) Published
Abstract [en]

We apply a three-dimensional magnetohydrodynamic (MHD) model to study the influence of inhomogeneities in Europa's atmosphere, as, for example, water vapor plumes, on Europa's plasma interaction with the Jovian magnetosphere. In our model we have included electromagnetic induction in a subsurface water ocean, collisions between ions and neutrals, plasma production and loss due to electron impact ionization, and dissociative recombination. We present a systematic study of the plasma interaction when a local inhomogeneity in the neutral density is present within a global sputtering generated atmosphere. We show that an inhomogeneity near the north or south pole affects the plasma interaction in a way that a pronounced north-south asymmetry is generated. We find that an Alfvén winglet develops within Europa's main Alfvén wing on that side where the inhomogeneity is located. In addition to the MHD model we apply an analytic model based on the model of Saur et al. (2007) to understand the role of steep gradients and discontinuities in the interaction. We compare our model results with the measured magnetic field data from three flybys of the Galileo spacecraft at Europa which included Alfvén wing crossings. Our analysis suggests that the magnetic field might be influenced by atmospheric inhomogeneities during the E26 flyby. The findings of this work will aid in the search for plumes at Europa in future plasma and field observations.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2016. Vol. 121, no 10, p. 9794-9828
Keywords [en]
Europa, MHD, plasma interaction
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-201781DOI: 10.1002/2016JA022479ISI: 000388965900032Scopus ID: 2-s2.0-84995804151OAI: oai:DiVA.org:kth-201781DiVA, id: diva2:1075292
Note

QC 20170217

Available from: 2017-02-17 Created: 2017-02-17 Last updated: 2017-04-24Bibliographically approved

Open Access in DiVA

fulltext(8092 kB)28 downloads
File information
File name FULLTEXT01.pdfFile size 8092 kBChecksum SHA-512
4c0a7c96d02e38b8768026ab214726d1e3825f0c6a431c15e3187f89a4c13bab7a6be8ba5b05acd04132b1462d583b4310e535782f3d7fe03dc59ad31ad76526
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Roth, Lorenz
By organisation
Space and Plasma Physics
In the same journal
Journal of Geophysical Research - Space Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 28 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 51 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