Journal
CHINESE SCIENCE BULLETIN
Volume 59, Issue 34, Pages 4797-4803Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-014-0583-0
Keywords
Flux rope; Core field; Magnetic reconnection; Guide field; Magnetotail
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Funding
- National Natural Science Foundation of China [41174140, 41374168, 41174147]
- Research Fund for the Doctoral Program of Higher Education of China [20110141110043]
- Program for New Century Excellent Talents in University [NCET-13-0446]
- China Post-doctoral Science Foundation
- Fundamental Research Fund for the Central Universities [2042014kf0017, 2012212020206, 2012212020204]
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Two consecutive magnetic flux ropes, separated by less than 30 s (Delta t < 30 s), are observed within one magnetic reconnection diffusion region without strong guide field in the Earth's magnetotail by Cluster multi-spacecraft. The flux ropes are characterized by bipolar signatures of the south-north magnetic field component B (z) accompanied with strong core magnetic field B (y) , intense current J and density depletions inside of them. In spite of the small but non-trivial global scale negative guide field (-B (y) ), there exists a directional change of the core fields of two flux ropes, i.e., -B (y) for the first one, and +B (y) for the second one. The directions of the core fields are the same as the ambient cross-tail magnetic field component (B (y) ) just outside of flux ropes. Therefore, we suggest that the core field of flux ropes is formed by compression of the local preexisting B (y) and that the directional change of core field is due to the change of local preexisting B (y) . Such a change in ambient B (y) might be caused by some microscale physics.
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