Substorm effects in MHD and test particle simulations of magnetotail dynamics

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Recent magnetohydrodynamic simulations demonstrate that a global tail instability, initiated by localized breakdown of MHD, can cause plasmoid formation and ejection as well as dipolarization and the current diversion of the substorm current wedge. The connection between the reconnection process and the current wedge signatures is provided by earthward flow from the reconnection site. Its braking and diversion in the inner magnetosphere causes dipolarization and the magnetic field distortions of the current wedge. The authors demonstrate the characteristic properties of this process and the current systems involved. The strong localized electric field associated with the flow burst and the dipolarization ... continued below

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15 p.

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Birn, J. & Hesse, M. December 31, 1998.

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  • Birn, J. Los Alamos National Lab., NM (United States)
  • Hesse, M. National Aeronautics and Space Administration, Greenbelt, MD (United States). Goddard Space Flight Center

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Description

Recent magnetohydrodynamic simulations demonstrate that a global tail instability, initiated by localized breakdown of MHD, can cause plasmoid formation and ejection as well as dipolarization and the current diversion of the substorm current wedge. The connection between the reconnection process and the current wedge signatures is provided by earthward flow from the reconnection site. Its braking and diversion in the inner magnetosphere causes dipolarization and the magnetic field distortions of the current wedge. The authors demonstrate the characteristic properties of this process and the current systems involved. The strong localized electric field associated with the flow burst and the dipolarization is also the cause of particle acceleration and energetic particle injections. Test particle simulations of orbits in the MHD fields yield results that are quite consistent with observed injection signatures.

Physical Description

15 p.

Notes

INIS; OSTI as DE99000754

Source

  • ICS-4: international conference on substorms, Tokyo (Japan), 15 May 1998

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  • Other: DE99000754
  • Report No.: LA-UR--98-2126
  • Report No.: CONF-9805129--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 296780
  • Archival Resource Key: ark:/67531/metadc675275

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 8, 2016, 8:54 p.m.

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Birn, J. & Hesse, M. Substorm effects in MHD and test particle simulations of magnetotail dynamics, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc675275/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.