X lines in the magnetotail for southward and northward IMF conditions

L. Q. Zhang, J. Y. Wang, W. Baumjohann, H. Rème, L. Dai, M. W. Dunlop, T. Chen, Y. Huang

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9 Scopus citations


Utilizing associated observations of Geotail and ACE satellites from the year of 1998 to 2005, we investigated the X lines in the near-Earth tail under different interplanetary magnetic field (IMF) conditions. The X lines are recognized by the tailward fast flows with negative Bz. Statistically, the X lines in the tail can be observed for southward as well as northward IMF, but more frequently observed for southward IMF. A typical case on 26 April 2005 showed clear evidence that the X line can occur for northward IMF while the geomagnetic activity is particularly quiet. Further analysis showed that the X line-related solar wind has stronger Ey and Bz components for southward than northward IMF. In addition, the X line-related geomagnetic activities are stronger for southward than northward IMF.

Original languageEnglish (US)
Pages (from-to)7764-7773
Number of pages10
JournalJournal of Geophysical Research: Space Physics
Issue number9
StatePublished - Sep 1 2015

Bibliographical note

Publisher Copyright:
©2015. American Geophysical Union. All Rights Reserved.


  • AE index
  • IMF condition
  • X line
  • solar wind
  • substorm


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