Magnetic island formation between large-scale flow vortices at an undulating postnoon magnetopause for northward interplanetary magnetic field

S. Eriksson, H. Hasegawa, Teh Wai Leong, B. U Ö Sonnerup, J. P. McFadden, K. H. Glassmeier, O. Le Contei, V. Angelopoulos, C. M. Cully, D. E. Larson, R. E. Ergun, A. Roux, C. W. Carlson

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Time History of Events and Macroscale Interactions during Substorms multispacecraft observations are presented for a 2-h-long postnoon magnetopause event on 8 June 2007 that for the first time indicate that the trailing (sunward) edges of Kelvin-Helmholtz (KH) waves are commonly related to small-scale N structure with enhanced total pressure at their center. Most of the small-scale FTEs are not related to any major plasma acceleration. TH-A observations of one small FTE at a transition from the low-latitude boundary layer (LLBL) into a magnetosheath plasma depletion layer were reconstructed using separate techniques that together confirm the presence of a magnetic island within the LLBL adjacent to the magnetopause. The island was associated with a small plasma vortex and both features appeared between two large-scale (~1 RE long and 2000 km wide) plasma vortices. We propose that the observed magnetic islands may have been generated from a time-varying reconnection process in a low ion plasma beta (βi, <0.2) and low 8.3° field shear environment at the sunward edge of the growing KH waves where the local magnetopause current sheet may be compressed by the converging flow of the large-scale plasma vortices as suggested by numerical simulations of the KH instability.

Original languageEnglish
Article numberA00C17
JournalJournal of Geophysical Research: Space Physics
Volume114
Issue number2
DOIs
Publication statusPublished - 1 Feb 2009
Externally publishedYes

Fingerprint

Magnetopause
vortex flow
magnetic islands
magnetopause
interplanetary magnetic fields
magnetic fields
Vortex flow
vortices
Magnetic fields
magnetic field
Plasmas
plasma
vortex
tropical regions
boundary layers
shear stress
plasma acceleration
Boundary layers
boundary layer
Kelvin-Helmholtz instability

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics

Cite this

Magnetic island formation between large-scale flow vortices at an undulating postnoon magnetopause for northward interplanetary magnetic field. / Eriksson, S.; Hasegawa, H.; Wai Leong, Teh; Sonnerup, B. U Ö; McFadden, J. P.; Glassmeier, K. H.; Le Contei, O.; Angelopoulos, V.; Cully, C. M.; Larson, D. E.; Ergun, R. E.; Roux, A.; Carlson, C. W.

In: Journal of Geophysical Research: Space Physics, Vol. 114, No. 2, A00C17, 01.02.2009.

Research output: Contribution to journalArticle

Eriksson, S, Hasegawa, H, Wai Leong, T, Sonnerup, BUÖ, McFadden, JP, Glassmeier, KH, Le Contei, O, Angelopoulos, V, Cully, CM, Larson, DE, Ergun, RE, Roux, A & Carlson, CW 2009, 'Magnetic island formation between large-scale flow vortices at an undulating postnoon magnetopause for northward interplanetary magnetic field', Journal of Geophysical Research: Space Physics, vol. 114, no. 2, A00C17. https://doi.org/10.1029/2008JA013505
Eriksson, S. ; Hasegawa, H. ; Wai Leong, Teh ; Sonnerup, B. U Ö ; McFadden, J. P. ; Glassmeier, K. H. ; Le Contei, O. ; Angelopoulos, V. ; Cully, C. M. ; Larson, D. E. ; Ergun, R. E. ; Roux, A. ; Carlson, C. W. / Magnetic island formation between large-scale flow vortices at an undulating postnoon magnetopause for northward interplanetary magnetic field. In: Journal of Geophysical Research: Space Physics. 2009 ; Vol. 114, No. 2.
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