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
Intense Electric Fields and Electron-Scale Substructure Within Magnetotail Flux Ropes as Revealed by the Magnetospheric Multiscale Mission
Imperial Coll London, Dept Phys, London, England..
Imperial Coll London, Dept Phys, London, England..
Austrian Acad Sci, Space Res Inst, Graz, Austria..
Austrian Acad Sci, Space Res Inst, Graz, Austria..
Show others and affiliations
2018 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 17, p. 8783-8792Article in journal (Refereed) Published
Abstract [en]

Three flux ropes associated with near-Earth magnetotail reconnection are analyzed using Magnetospheric Multiscale observations. The flux ropes are Earthward propagating with sizes from similar to 3 to 11 ion inertial lengths. Significantly different axial orientations are observed, suggesting spatiotemporal variability in the reconnection and/or flux rope dynamics. An electron-scale vortex, associated with one of the most intense electric fields (E) in the event, is observed within one of the flux ropes. This E is predominantly perpendicular to the magnetic field (B); the electron vortex is frozen-in with E x B drifting electrons carrying perpendicular current and causing a small-scale magnetic enhancement. The vortex is similar to 16 electron gyroradii in size perpendicular to B and potentially elongated parallel to B. The need to decouple the frozen-in vortical motion from the surrounding plasma implies a parallel E at the structure's ends. The formation of frozen-in electron vortices within reconnection-generated flux ropes may have implications for particle acceleration. Plain LanguageSummary The release of magnetic energy into particle motion through magnetic reconnection is a key driver of dynamics in the Earth's magnetosphere and other space plasmas. In order to understand how the released magnetic energy is distributed and ultimately heats the particles, a detailed examination of the structures formed by magnetic reconnection is necessary. One common structure produced by reconnection is a twisted magnetic field known as a flux rope. We use new data from the National Aeronautics and Space Administration's Magnetospheric Multiscale satellites to examine both the large-and small-scale properties of three flux ropes associated with a single reconnection event. The results reveal the intrinsic three-dimensional nature of the overall reconnection event, which may stem either from variability at the reconnection site and/or the subsequent dynamics of the structures after they form. Additionally, the high-resolution measurements reveal a new small-scale structure, namely, a vortex of electrons, inside of one of the flux ropes. The presence of such vortices may contribute to accelerating particles and points to the necessity of better understanding the substructure of flux ropes in order to characterize particle energization in magnetic reconnection.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2018. Vol. 45, no 17, p. 8783-8792
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-236016DOI: 10.1029/2018GL079095ISI: 000445727500010Scopus ID: 2-s2.0-85053415881OAI: oai:DiVA.org:kth-236016DiVA, id: diva2:1255731
Note

QC 20181015

Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-12-03Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Lindqvist, Per-Arne

Search in DiVA

By author/editor
Lindqvist, Per-Arne
By organisation
Space and Plasma Physics
In the same journal
Geophysical Research Letters
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 12 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