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Proton Acceleration in a Single Loop disrupted during Collision of Two Moving Solitary Magnetic Kinks
J.I. Sakai, A. Kakimoto & I.V. Sokolov1)
Laboratory for Plasma Astrophysics, Toyama University, Toyama, 930-8555, Japan
1) Space Physics Research Laboratory, The University of Michigan, Ann Arbor, MI 48109-2143, USA
We investigate a new model of single loop flare based on the fact that a magnetic flux tube with
axial current can be explosively disrupted during collision of two moving solitary magnetic kinks (MoSMaK)[1].
By using three-dimensional electromagnetic fields obtained from a resistive three-dimensional MHD equations, we investigate the orbit of many protons to obtain their energy spectrum. We found that the protons can be accelerated to $\gamma$-ray-emitting energies($>$ 1$MeV$) with a power-law spectrum. The protons are
accelerated near the three-dimensional current sheets with complicated structures in a disrupted single loop.
We study two cases of plasma beta; $\beta=0.5$ and $\beta=0.05$. In a high beta case($\beta=0.5$), the disruption of a loop is more violent than the other case. The proton acceleration is different in details for both cases. However, the energy spectrum is almost same for both cases.
References
[1] J.I. Sakai, K. Nishi & I.V. Sokolov, The Astrophysical Journal, 576 (2002) 519
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