THEMIS observations of an earthward‐propagating dipolarization front

  • A. Runov
    Institute of Geophysics and Planetary Physics University of California Los Angeles California USA
  • V. Angelopoulos
    Institute of Geophysics and Planetary Physics University of California Los Angeles California USA
  • M. I. Sitnov
    Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
  • V. A. Sergeev
    St. Petersburg State University St. Petersburg, 198504 Russia
  • J. Bonnell
    Space Science Laboratory University of California Berkeley California USA
  • J. P. McFadden
    Space Science Laboratory University of California Berkeley California USA
  • D. Larson
    Space Science Laboratory University of California Berkeley California USA
  • K.‐H. Glassmeier
    Institute of Geophysics and Extraterrestrial Physics Technical University Braunschweig Braunschweig Germany
  • U. Auster
    Institute of Geophysics and Extraterrestrial Physics Technical University Braunschweig Braunschweig Germany

書誌事項

公開日
2009-07
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2009gl038980
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We report THEMIS observations of a dipolarization front, a sharp, large‐amplitude increase in the <jats:italic>Z</jats:italic>‐component of the magnetic field. The front was detected in the central plasma sheet sequentially at X = −20.1 R<jats:sub><jats:italic>E</jats:italic></jats:sub> (THEMIS P1 probe), at X = −16.7 R<jats:sub><jats:italic>E</jats:italic></jats:sub> (P2), and at X = −11.0 R<jats:sub><jats:italic>E</jats:italic></jats:sub> (P3/P4 pair), suggesting its earthward propagation as a coherent structure over a distance more than 10 R<jats:sub><jats:italic>E</jats:italic></jats:sub> at a velocity of 300 km/s. The front thickness was found to be as small as the ion inertial length. Comparison with simulations allows us to interpret the front as the leading edge of a plasma fast flow formed by a burst of magnetic reconnection in the midtail.</jats:p>

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