Evidence for pearl-like magnetic island structures at dawn and dusk side magnetopause

Teh Wai Leong, L. N. Hau

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Two-dimensional magnetopause structure with a series of pearl-like magnetic islands at the dawn side of the equatorial plane was reported earlier by Hau and Sonnerup (1999) from the AMPTE/IRM data by solving the Grad-Shafranov equation as a spatial initial value problem. This paper presents another rare event that appears like the image of the dawn event at the dusk side magnetopause based on the analysis of two years satellite data and similar reconstruction method. The two crossings occur at (x, y, z) = (7.13, -6.64, 0.4) and (7.93, 9.06, -1.89) RE with magnetopause normal n̂ being (0.85, -0.52, 0.003) and (0.82, 0.55, -0.17) in the GSE coordinates, respectively. Both events are tangential discontinuity-like structures with shear angles being 124° and 97° and convect tailward with the deHoffmann-Teller frame velocity VHT of (- 141.88, -215.47, 72.48) and (- 100.26, 144.52, 20.90) (km/s), respectively, that form approximately 90° from n̂. The magnetic field configurations in both cases show great similarity with the same island width of ∼500 km and aspect ratio of ∼0.2.

Original languageEnglish
Pages (from-to)681-686
Number of pages6
JournalEarth, Planets and Space
Volume56
Issue number7
Publication statusPublished - 2004
Externally publishedYes

Fingerprint

magnetic islands
magnetopause
AMPTE (satellites)
information resources management
magnetic field configurations
boundary value problems
aspect ratio
satellite data
discontinuity
shear
magnetic field

Keywords

  • Current layer
  • Magnetopause
  • Reconnection
  • Tearing-mode instability

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Evidence for pearl-like magnetic island structures at dawn and dusk side magnetopause. / Wai Leong, Teh; Hau, L. N.

In: Earth, Planets and Space, Vol. 56, No. 7, 2004, p. 681-686.

Research output: Contribution to journalArticle

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