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Plasma sheet formation during long period of northward IMF
Author(s) -
Li Wenhui,
Raeder Joachim,
Dorelli John,
Øieroset Marit,
Phan Tai D.
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl021524
Subject(s) - magnetosheath , plasma sheet , magnetosphere , physics , plasma , geophysics , solar wind , earth's magnetic field , magnetic reconnection , interplanetary magnetic field , magnetopause , atmospheric sciences , geology , magnetic field , quantum mechanics
We have studied the entry paths of solar wind plasma into the magnetosphere during an extended period of northward IMF using an OpenGGCM MHD simulation of the cold dense plasma sheet (CDPS) event observed on October 23, 2003 by the Cluster spacecraft. We find that high‐latitude reconnection occurs tailward of both cusps between the IMF and geomagnetic field. The newly created closed magnetic flux tubes capture magnetosheath plasma, and subsequently sink and shrink into the magnetosphere, while convecting tailward. The plasma that enters near the reconnection site is driven sunward and toward the low latitude region initially; it then drifts to the flanks. The captured plasma is characterized by small flow velocity, and it is moderately heated in the reconnection region. In the present case study we find the cold plasma enters the plasma sheet in the near Earth tail where it is observed by Cluster.