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Computer modelling of three-dimensional dynamics of fast reconnection

Published online by Cambridge University Press:  13 March 2009

M. Ugai
M. Ugai
Affiliation:
Department of Computer Science, Faculty of Engineering, Ehime University, Matsuyama 790, Japan
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Abstract

Computer simulations are used to investigate the basic three-dimensional structure of the fast reconnection mechanism spontaneously developing from a long current sheet. It is shown that if three-dimensional effects (∂sol;∂z ≠ 0) are not so strong, a locally enhanced resistivity results in current-sheet thinning, and a fast reconnection process, involving switch-off shocks, is eventually set up in a region limited in the z direction. The fast reconnection process near the z = 0 plane becomes quasi-steady and two-dimensional (∂/∂z = 0), so that the well-known Petschek mechanism is fully applicable. Distinct plasma rarefaction occurs inside the fast reconnection region, so that fast-mode expansion may propagate in the z direction, and the resulting inflow velocity uz takes the magnetic field into the fast reconnection region and contracts the latter. The global current system undergoes drastic changes during the fast-reconnection development. The current flow, initially directed in the z direction, first converges towards the neutral line, and is then largely deflected away from this line in the inner reconnection region.

Type
Research Article
Information
Journal of Plasma Physics , Volume 45 , Issue 2 , April 1991 , pp. 251 - 266
Copyright
Copyright © Cambridge University Press 1991

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References

REFERENCES

Birn, J. & Hones, E. W. 1981 J. Geophys. Res. 86, 6802.CrossRefGoogle Scholar
Biskamp, D. 1986 Phys. Fluids, 29, 1520.Google Scholar
Coroniti, F. V. & Eviatar, A. 1977 Astrophys. J. Suppl. 33, 189.Google Scholar
Forbes, T. G. & Priest, E. R. 1982 Solar Phys. 81, 303.Google Scholar
Lee, L. C. & FC, Z: F. 1986 J. Geophys. Res. 91, 4551.CrossRefGoogle Scholar
Petschek, H. E. 1964 NASA SP-50, p. 425.Google Scholar
Priest, E. R. & Forbes, T. G. 1986 J. Geophys. Res. 91, 5579.Google Scholar
Sato, T. & Hayashi, T. 1979 Phys. Fluids, 22, 1189.CrossRefGoogle Scholar
Sato, T., Hayashi, T., Walker, R. J. & Ashour-Abdalla, M. 1983 Geophys. Res. Lett. 10, 221.Google Scholar
Scholer, M. 1989 J. Geophys. Res. 94, 8805.CrossRefGoogle Scholar
Scholer, M. & Roth, D. 1987 J. Geophys. Res. 92, 3223.CrossRefGoogle Scholar
Smith, D. F. & Priest, E. R. 1972 Astrophys. J. 176, 487.Google Scholar
Sonnerup, B. U. Ö. 1970 J. Plasma Phys. 4, 161.Google Scholar
Tsuda, T. & Ugai, M. 1977 J. Plasma Phys. 18, 451.Google Scholar
Ugai, M. 1984 Plasma Phys. Contr. Fusion, 26, 1549.Google Scholar
Ugai, M. 1986 Phys. Fluids, 29, 3659.Google Scholar
Ugai, M. 1988 Comp. Phys. Commun. 49, 185.Google Scholar
Ugai, M. 1989 Phys. Fluids, B 1, 942.Google Scholar
Ugai, M. & Tsuda, T. 1977 J. Plasma Phys. 17, 337.Google Scholar
Ugai, M. & Tsuda, T. 1979 J. Plasma Phys. 22, 1.CrossRefGoogle Scholar