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Numerical Simulations of Relativistic Expansion of Magnetic Arcades in Magnetars

Numerical Simulations of Relativistic Expansion of Magnetic Arcades in Magnetars. Eiji Asano 1 , Hiroyuki Takahashi 1 and Ryoji Matsumoto 2 1:Graduate School of Science and Technology, Chiba University 2:Department of Physics, Faculty of Science, Chiba University. Soft g -ray Repeaters.

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Numerical Simulations of Relativistic Expansion of Magnetic Arcades in Magnetars

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  1. Numerical Simulations of Relativistic Expansion of Magnetic Arcades in Magnetars Eiji Asano1, Hiroyuki Takahashi1andRyoji Matsumoto21:Graduate School of Science and Technology, Chiba University2:Department of Physics, Faculty of Science, Chiba University 2nd EAST-ASIA NUMERICAL ASTROPHYSICS MEETING (KASI, Daejeon, Korea)

  2. Soft g-ray Repeaters • According to a model of soft g-ray repeaters proposed by Thompson & Duncan (2001), we simulated the relativistic expansion of magnetic arcades. • To study the mechanism of the releasing energy in magnetars, we carried out simulations of two models relativistic force-free equations.The codes are based on HLL method. (NASA Marshall Spaceflight Center)

  3. Simulations • Local simulation (2.5D Relativistic MHD eqs.) • Model A: Interaction of neutron star and its disk (Asano et al., 2005) This model can be applied the disk is formed around the magnetar.Result: Magnetic loops connecting neutron star and its disk is twisted, they expand relativistic speed. Result: The plasma velocity reaches the speed of light in the case of a strongly magnetic field.

  4. Simulations • Model B: Isolated neutron star A tangled magnetic field inside a magnetar creates rising magnetic arcades. Result: When critical twist is accumulated in the arcades, the relativistic expansion of magnetic arcades occur. (Lorents factor g>10)

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