Growth, sudden enhancement, and relaxation of current sheets in the magnetotail: Two‐dimensional substorm dynamics

Z. W. Ma, Xiaogang Wang, Amitava Bhattacharjee

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

A two‐dimensional, low‐dissipation magnetohydrodynamic simulation is used as a model for magnetospheric substorm dynamics. The simulation begins from a Grad‐Shafranov equilibrium of the magnetotail including the Earth's dipole field. This initial configuration is driven by a continuous electric field (of IMF origin) which induces equatorward flows. A thin current sheet develops algebraically in time, spanning Y‐points that stretch from the mid‐tail region (∼30 RE) to the near‐Earth region (∼10 RE). In the late growth phase, rapid thinning of the sheet and near‐explosive intensification of the current density are observed. The onset of a partial current disruption results from the formation of small islands in the near‐Earth region. Numerical results are compared with observations.

Original languageEnglish (US)
Pages (from-to)2985-2988
Number of pages4
JournalGeophysical Research Letters
Volume22
Issue number21
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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