Numerical study of asymmetric driven reconnection at dayside magnetopause

  • Jin Shuping 
  • Shen Juntai 
  • Hao Lei 
  • Hu Xianpeng 


A two-dimensional compressible MHD code has been used to numerically study the asymmetric driven reconnection processes in the vicinity of the magnetopause. The initial magnetic field configuration is assumed to be in a mechanical equilibrium state. The cases with identical temperatures (T m0/T s0=1.0) and four different ratios of magnetic field strength (Q=B m0/B s0=1.0, 1.5, 2.0, 2.5), and the case withT m0/T s0=2.0 andQ=1.5 are investigated (B m0,T m0 andB s0,T s0 are the initial magnetic strength and temperature outside the current sheet on the magnetosphere and the magnetosheath, respectively). When the magnetic field on the magnetosheath side is set as southward, a recurrent formation of multiple magnetic bubbles with various scales occurs under the action of the inward plasma flow imposed at the left and right boundaries. In the simulation, some bubbles coalesce into a bigger one and then it is convected out of the simulation domain; the others are convected through the top boundary all alone. Thus, the plasmoid events with different scales and different time intervals take place intermittently and the impulsive features of magnetic reconnection are clearly shown. The multiple magnetic islands are all high-temperature and large-density regions in comparison with the ambient environment. The bipolar signatures or fluctuant variations of normal magnetic field component are generated by the formation of multiple magnetic islands. This result is similar to the FTEs signature.


compressible MHD code asymmetric driven reconnection dayside magnetopause 


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  1. 1.
    Russell, C. T., Elphic, R. C., Initial ISEE magnetometer results: Magnetopause observations, Space Sci. Rev., 1978, 22: 681.CrossRefGoogle Scholar
  2. 2.
    Russell, C. T., Elphic, R. C., ISEE observations of flux transfer events at the dayside magnetopause, Geophys. Res. Lett., 1979, 6: 33.CrossRefGoogle Scholar
  3. 3.
    Lee, L. C., Fu, Z. F., A theory of magnetic flux transfer at the Earth’s magnetopause, Geophys. Res. Lett., 1985, 12: 105.CrossRefGoogle Scholar
  4. 4.
    Fu, Z. F., Lee, L. C., Simulation of multiple X-line at the dayside magnetopause, Geophys. Res. Lett., 1985, 12: 291.CrossRefGoogle Scholar
  5. 5.
    Scholer, M., Magnetic flux transfer at the magnetopause based on single X line bursty reconnection, Geophys. Res. Lett., 1988, 15: 291.CrossRefGoogle Scholar
  6. 6.
    Southwood, D. J., Farrugia, C. J., Saunders, M. A., What are flux transfer events? Planet. Space Sci., 1988, 36: 503.CrossRefGoogle Scholar
  7. 7.
    Liu, Z. X., Hu, Y. D., Local magnetic reconnection caused by vortices in the flow field, Geophys. Res., Lett., 1988, 15: 752.CrossRefGoogle Scholar
  8. 8.
    Pu, Z. Y., Hou, P. T., Liu, Z. X., Vortex-induced tearing mode instability as a source of flux transfer events, J. Geophys. Res., 1990, 95: 18861.CrossRefGoogle Scholar
  9. 9.
    Rijinbeek, R. P., Cowley, S. W. H., Southwood, D. J. et al., A survcy of dayside flux transfer events observed by the IEEE 1 and 2 magnetometers, J. Geophys. Res., 1984, 89: 786.CrossRefGoogle Scholar
  10. 10.
    Lockwood, M., Wild, M. N., On the quasi-periodic nature of magnetopause flux transfer events, J. Geophys. Res., 1993, 98: 5935.CrossRefGoogle Scholar
  11. 11.
    Matthaeus, W. H., Lamkin, S. L., Turbulent magnetic reconnection, Phys. Fluids, 1986, 29: 2513.CrossRefGoogle Scholar
  12. 12.
    Priest, E. R., Magnetic reconnection on the sun, Mitt. Astron. Res., 1986, 65: 41.Google Scholar
  13. 13.
    Jin, S. P., Ip, W. H., Two-dimensional compressible MHD simulation of driven reconnection process, Phys. Fluids B, 1991, 3: 1927.CrossRefGoogle Scholar
  14. 14.
    Ip, W. H., Jin, S. P., 2D numerical study of recurrent driven reconnection process at the magnetopause, Geophys. Res. Lett., 1991, 18: 1497.CrossRefGoogle Scholar
  15. 15.
    Scholer, M., Asymmetric time-dependent and stationary magnetic reconnection at the dayside magnetopause, J. Geophys. Res., 1989, 94: 15099.CrossRefGoogle Scholar
  16. 16.
    Ding, D. Q., Lee, L. C., Ma, Z. W., Different FTEs signatures generated by the bursty single X line reconnection and the multiple X line reconnection at the dayside magnetopause, J. Geophys. Res., 1991, 96: 57.CrossRefGoogle Scholar
  17. 17.
    Jin, S. P., Inhester, B., Innes, D., A 2D numerical study of explosive events in the solar atmosphere, Solar Phys., 1996, 168: 279.CrossRefGoogle Scholar
  18. 18.
    Hu, Y. Q., A multiple implicit scheme for time-dependent 2-dimensional magnetohydrodynamics flow., J. Comput. Phys., 1989, 84: 441.MATHCrossRefMathSciNetGoogle Scholar

Copyright information

© Science in China Press 2000

Authors and Affiliations

  • Jin Shuping 
    • 1
    • 2
  • Shen Juntai 
    • 1
    • 2
  • Hao Lei 
    • 1
    • 2
  • Hu Xianpeng 
    • 1
    • 2
  1. 1.Department of Earth and Space ScienceUniversity of Science and Technology of ChinaHefeiChina
  2. 2.Advanced Center for Earth Science and Astronomy, University of Science and Technology of ChinaThird World Academy of ScienceHefeiChina

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