Modeling the Growth-Phase of a Substorm Using the Tsyganenko Model and Multi-Spacecraft Observations - Cdaw-9

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Tuija Pulkkinen

  • DN BAKER
  • DH FAIRFIELD
  • R.J. PELLINEN
  • JS MURPHREE
  • RD ELPHINSTONE
  • RL MCPHERRON
  • JF FENNELL
  • RE LOPEZ
  • T NAGAI

Research units

  • NASA Goddard Space Flight Center
  • Finnish Meteorological Institute
  • University of Calgary
  • University of California at Los Angeles
  • Applied Research Corporation
  • Japan Meteorological Agency, Meteorological Research Institute
  • Aerospace Corporation

Abstract

The CDAW-9 Event C focused upon the early part of 3 May 1986 when a large substorm onset occurred at 0111 UT. By modifying the Tsyganenko 1989 magnetic field model, we construct a model in which the near-Earth current systems are enhanced with time to describe the observed development of the tail magnetic field during the growth phase. The cross-tail current intensity and the thickness of the current sheet are determined by comparison with three space-craft in the near-Earth tail. The location of the auroral bulge as recorded by the Viking imager is mapped to the equatorial current sheet. The degree of chaotization of the thermal electrons is estimated, and the consequences to the tail stability towards ion tearing are discussed. We conclude that the mapping of the brightening region in the auroral oval corresponds to the regions in the tail where the current sheet may be unstable towards ion tearing.

Details

Original languageEnglish
Pages (from-to)1963-1966
Number of pages4
JournalGeophysical Research Letters
Volume18
Issue number11
Publication statusPublished - Nov 1991
MoE publication typeA1 Journal article-refereed

    Research areas

  • TAIL CURRENT SHEET, ONSET

ID: 2940468