Abstract
We report on the results of plasma jet and shock formation during the current loop coalescence in solar flares. It is shown by a theoretical model based on the ideal MHD equation that the spiral, two-sided plasma jet can be explosively driven by the plasma rotational motion induced during the two current loop coalescence process. The maximum velocity of the jet can exceed the Alfvén velocity, depending on the plasma β (= c 2 s v 2 A ) ratio. The acceleration time getting to the maximum jet velocity is quite short and le than 1 s. The rebound following the plasma collapse driven by magnetic pinch effect can strongly induce super-Alfvénic flow. We present the condition of the shock formation. We briefly discuss the high-energy particle acceleration during the plasma collapse as well as by the shocks.
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Doschek, G. A. et al.: 1986, in M. R. Kundu and B. Woodgate (eds.), Proc. SMM Workshop, Energetic Phenomena on the Sun, NASA CP-2439, p. 4-1.
Gold, T. and Hoyle, F.: 1960, Monthly Notices Roy. Astron. Soc. 120, 89.
Kundu, M. R. and Woodgate, B. (eds.): 1986, Proc. SMM Workshop, Energetic Phenomena on the Sun, NASA CP-2439.
Machado, M. E., Moore, R. L., Hernandez, A. M., Rovira, M. G., Haggard, M. J., and Smith, J. B.: 1988a, Astrophys. J. 326, 425.
Machado, M. E., Xiao, Y. C., Wu, S. T., Prakakis, Th., and Dialetis, D.: 1988b, Astrophys. J. 326, 451.
Ohsawa, Y. and Sakai, J-I.: 1987, Astrophys. J. 313, 440.
Ohsawa, Y. and Sakai, J-I.: 1988, Astrophys. J. 332, 439.
Ramaty, R. and Murphy, R. J.: 1987, Space Sci. Rev. 45, 213.
Sakai, J-I.: 1989, in preparation.
Sakai, J-I. and Ohsawa, Y.: 1987, Space Sci. Rev. 46, 113.
Sakai, J-I. and Tajima, T.: 1986, Proc. Joint Varenna-Abastumani Int. School and Workshop on Plasma Astrophysics, ESA (Sukhumi), SP-251, p. 77.
Sturrock, P. A. (ed.): 1980, Solar Flares: Monograph from Skylab Solar Workshop 2, Colorado Associated University Press, Boulder.
Švestka, Z.: 1976, Solar Flares, D. Reidel Publ. Co., Dordrecht, Holland.
Tajima, T., Brunel, F., and Sakai, J-I.: 1982, Astrophys. J. 245, L45.
Tajima, T., Sakai, J-I., Nakajima, H., Kosugi, T., Brunel, F., and Kundu, M. R.: 1987, Astrophys. J. 321, 1031.
Zaidman, E. G.: 1986, IFSR No. 246, Institute for Fusion Studies, University of Texas, Austin.
Zarro, D. M., Canfield, R. C., Strong, K. T., and Metcalf, T. R.: 1988, Astrophys. J. 324, 582.
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Sakai, JI. Plasma jet and shock formation during current loop coalescence in solar flares. Sol Phys 120, 117–124 (1989). https://doi.org/10.1007/BF00148537
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DOI: https://doi.org/10.1007/BF00148537