Effects on the distant geomagnetic tail of a fivefold density drop in the inner sheath region of a magnetic cloud: A joint Wind-ACE study

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1016/j.asr.2009.07.003

Ключевые слова: Effects in the distant tail of large density drop, ICME/MC-sheaths-magnetosheath interactions, Bow shocks, Dynamic pressures, En-route, Extreme conditions, Extreme value, Geomagnetic tail, In-orbit, Magnetic clouds, Magnetosheaths, MHD simulation, Neutral sheets, Sheath regions, Sun-earth line, Wind spacecraft, Geomagnetism, Interplanetary spacecraft, Magnetic fields, Plasma interactions, Pressure drop, Semiconductor counters, Solar system, Wind effects

Аннотация: Using a serendipitous configuration of the ACE and Wind spacecraft, we monitor the response of the distant geomagnetic tail (similar to-220 R(E)) to an abrupt, approx. fivefold pressure drop (from similar to 19.0 to similar to 3.5 nPa) at the front boundary of a magnetic cloud (MC) on November 20, 2003. The interplanetary data are from ACE in orbit around the L1 point. The far-tail observations are from Wind, which was nominally in the magnetosheath, separated from the Sun-Earth line by similar to 40 R(E). The magnetic field in the innermost sheath region of the MC had a large B(y) (similar to 30 nT) and substantial and variable flows lateral to the Sun-Earth line. There was also a significant northward field (similar to 35 nT), unique in the vicinity of this MC. These extreme values are reached in a filament forming the earliest relic of material accreted by the MC en route to Earth. The effects resulting from these on the far geomagnetic tail are: (1) expansion, (2) tail twisting, and (3) tail tilting. These extreme conditions were in part responsible for a crossing by Wind of a neutral sheet which is tilted by similar to 85 degrees to the ecliptic. Further, Wind made two successive excursions deep into the geomagnetic tail, in the first of which a tailward flow burst of similar to 1200 km/s was observed. The dayside part of the interaction of the sudden and large dynamic pressure drop with the bow shock is studied with a local 3D MHD simulation. This work is a contribution to the area ICME/MC-sheaths-magnetosheath interactions. (C) 2009 COSPAR. Published by Elsevier Ltd. All rights reserved.

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Выпуск журнала: Vol. 44, Is. 11

Номера страниц: 1288-1294

ISSN журнала: 02731177

Место издания: OXFORD



  • Farrugia C.J. (Space Science Center,University of New Hampshire)
  • Taubenschuss U. (Space Research Institute,Austrian Academy of Sciences)
  • Biernat H.K. (Institute of Physics,University of Graz)
  • Maynard N.C. (Space Science Center,University of New Hampshire)
  • Torbert R.B. (Space Science Center,University of New Hampshire)
  • Erkaev N.V. (Siberian Federal University)
  • Richardson I.G. (CRESST/Dept. of Astronomy,University of Maryland)
  • Ogilvie K.W. (NASA Goddard Space Flight Center)
  • Szabo A. (NASA Goddard Space Flight Center)
  • Sandholt P.E. (Department of Physics,University of Oslo)
  • Langmayr D. (The Virtual Vehicle Competence Center (vif))

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