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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 6
Ann. Geophys., 24, 1759–1765, 2006
https://doi.org/10.5194/angeo-24-1759-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 1759–1765, 2006
https://doi.org/10.5194/angeo-24-1759-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Jul 2006

03 Jul 2006

Multiple Triangulation Analysis: another approach to determine the orientation of magnetic flux ropes

X.-Z. Zhou1, Q.-G. Zong2, Z. Y. Pu1, T. A. Fritz3, M. W. Dunlop4, Q. Q. Shi5, J. Wang1, and Y. Wei6 X.-Z. Zhou et al.
  • 1Institute of Space Physics and Applied Technology, Peking University, Beijing 100871, China
  • 2Center for Atmospheric Research, University of Massachusetts, Lowell, MA 01854, USA
  • 3Center for Space Physics, Boston University, Boston, MA 02215, USA
  • 4Space Sciences Division, Rutherford Appleton Laboratory, Oxfordshire, UK
  • 5Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China
  • 6Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Abstract. Another approach (Multiple Triangulation Analysis, MTA) is presented to determine the orientation of magnetic flux rope, based on 4-point measurements. A 2-D flux rope model is used to examine the accuracy of the MTA technique in a theoretical way. It is found that the precision of the estimated orientation is dependent on both the spacecraft separation and the constellation path relative to the flux rope structure. However, the MTA error range can be shown to be smaller than that of the traditional MVA technique. As an application to real Cluster data, several flux rope events on 26 January 2001 are analyzed using MTA, to obtain their orientations. The results are compared with the ones obtained by several other methods which also yield flux rope orientation. The estimated axis orientations are shown to be fairly close, suggesting the reliability of the MTA method.

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