Skip to main content

Advertisement

We’d like to understand how you use our websites in order to improve them. Register your interest.

Thermo-dynamic plasma expansion acceleration in asymmetric spontaneous fast magnetic reconnection

Abstract

Asymmetric spontaneous fast magnetic reconnection model, in which the current sheet is initially put between two antiparallel straight magnetic field regions with different magnetic intensities, is studied by two-dimensional magnetohydrodynamic (MHD) simulations. Especially, the supersonic expansion acceleration process which has been already observed in the symmetric case is focused on. In this paper, we find that if the initial asymmetry features are weak and one side of the magnetic field regions consists of sufficiently low beta plasma, the supersonic expansion acceleration process is generated in the reconnection jet region, like the symmetric case. Hence, in such an asymmetric case, a fast shock is formed at the top of the magnetic loop.

References

  1. Semenov, V. S., I. V. Kubyshkin, M. F. Heyn, and H. K. Biernat, Field-line reconnexion in the two-dimensional asymmetric case, J. Plasma Phys., 30, 321–344, 1983.

    Article  Google Scholar 

  2. Shimizu, T. and M. Ugai, Adiabatic expansion acceleration mechanism of superfast jets in the spontaneous fast magnetic reconnection model, Phys. Plasmas, 7(6), 2417–2424, 2000.

    Article  Google Scholar 

  3. Ugai, M. and T. Tsuda, Magnetic field line reconnection by localized enhancement of resistivity. Part 1. Evolution in a compressible MHD fluid, J. Plasma Phys., 17(P3), 337–356, 1977.

    Article  Google Scholar 

  4. Ugai, M. and T. Shimizu, Computer Studies on Noncoplanar Slow and Intermediate Shocks Associated with the Sheared Fast Reconnection Mechanism, Phys. Fluids B, 1(2), 296–307, 1994.

    Google Scholar 

  5. Ugai, M. and T. Shimizu,ai]Ugai, M. and T. Shimizu, Computer studies on the spontaneous fast reconnection mechanism in three dimensions, Phys. Plasmas, 3, 853–862, 1996.

    Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Tohru Shimizu.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Shimizu, T., Ugai, M. Thermo-dynamic plasma expansion acceleration in asymmetric spontaneous fast magnetic reconnection. Earth Planet Sp 53, 673–676 (2001). https://doi.org/10.1186/BF03353287

Download citation

Keywords

  • Current Sheet
  • Magnetic Loop
  • Asymmetric Case
  • Reconnection Process
  • Anomalous Resistivity