THEMIS observations of a secondary magnetic island within the Hall electromagnetic field region at the magnetopause

Teh Wai Leong, S. Eriksson, B. U Ö Sonnerup, R. Ergun, V. Angelopoulos, K. H. Glassmeier, J. P. McFadden, J. W. Bonnell

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We present THEMIS observations of a small-scale secondary magnetic island within the Hall electromagnetic field region at the dayside magnetopause. The reconnecting magnetic fields are nearly symmetric and anti-parallel, whereas the ion plasma density is ∼8 times higher in the magnetosheath than in the magnetosphere. In the event, the Hall magnetic and electric fields are asymmetric and stronger on the magnetospheric side of the magnetopause. The small-scale magnetic island was immersed in the out-of-plane Hall magnetic field on the magnetosheath side. We derive a map of the cross section of the magnetic island by use of magnetohydrostatic Grad-Shafranov reconstruction under the force-free assumption. The reconstruction shows a right-handed magnetic island with a length of ∼200 km and a width of ∼100 km.

Original languageEnglish
Article numberL21102
JournalGeophysical Research Letters
Volume37
Issue number21
DOIs
Publication statusPublished - 1 Nov 2010
Externally publishedYes

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magnetic islands
magnetopause
electromagnetic field
electromagnetic fields
magnetosheath
magnetic field
magnetohydrostatics
magnetic fields
magnetospheres
plasma density
magnetosphere
electric field
cross section
plasma
electric fields
ion
cross sections
ions

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Wai Leong, T., Eriksson, S., Sonnerup, B. U. Ö., Ergun, R., Angelopoulos, V., Glassmeier, K. H., ... Bonnell, J. W. (2010). THEMIS observations of a secondary magnetic island within the Hall electromagnetic field region at the magnetopause. Geophysical Research Letters, 37(21), [L21102]. https://doi.org/10.1029/2010GL045056

THEMIS observations of a secondary magnetic island within the Hall electromagnetic field region at the magnetopause. / Wai Leong, Teh; Eriksson, S.; Sonnerup, B. U Ö; Ergun, R.; Angelopoulos, V.; Glassmeier, K. H.; McFadden, J. P.; Bonnell, J. W.

In: Geophysical Research Letters, Vol. 37, No. 21, L21102, 01.11.2010.

Research output: Contribution to journalArticle

Wai Leong, T, Eriksson, S, Sonnerup, BUÖ, Ergun, R, Angelopoulos, V, Glassmeier, KH, McFadden, JP & Bonnell, JW 2010, 'THEMIS observations of a secondary magnetic island within the Hall electromagnetic field region at the magnetopause', Geophysical Research Letters, vol. 37, no. 21, L21102. https://doi.org/10.1029/2010GL045056
Wai Leong, Teh ; Eriksson, S. ; Sonnerup, B. U Ö ; Ergun, R. ; Angelopoulos, V. ; Glassmeier, K. H. ; McFadden, J. P. ; Bonnell, J. W. / THEMIS observations of a secondary magnetic island within the Hall electromagnetic field region at the magnetopause. In: Geophysical Research Letters. 2010 ; Vol. 37, No. 21.
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