Influence of the Variations of Current Sheet Parameters on the Acceleration of Electrons |
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| Authors: | Li Yan Lin Jun |
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| Institution: | 1. National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011;2. Graduate University of Chinese Academy of Sciences, Beijing 100049;3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;1. CERN, 1211 Geneva 23, Switzerland;2. BUGH Wuppertal, 42097 Wuppertal, Germany;3. III. Physikalisches Institut, RWTH Aachen, Germany;1. Department of Physics, M.I.T., 77 Massachusetts Av. 6-201, Cambridge, MA 02139, USA;2. Department of Physics, Vassar College, Poughkeepsie, NY 12604, USA;1. Faculty of Physics, Nanjing Railway Medical College, Nanjing 21009 China;2. Department of Astronomy, Nanjing University, Nanjing 210093 China;1. Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Room B4104, Bethesda, MD 20814-4799, USA;2. Xenogen Corporation, 860 Atlantic Ave, Alameda, CA 94501, USA;3. Tropical Disease Research Unit, Department of Pathology, University of California San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA;1. Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, PR China;2. Departamento de Fisica, Instituto Superior de Engenharia do Porto, 4200-072 Porto, Portugal |
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| Abstract: | By the test particle method, we have investigated the kinematic characteristics of the electrons in the reconnecting current sheet with a guiding magnetic field Bz after they are accelerated by the supper-Dreicer electric field Ez. Firstly, the influence of the guiding magnetic field Bz on the particle acceleration is discussed under the assumption that Bz is constant in magnitude but different in orientation with respect to the electric field. In this case, the variation of the Bz direction directly leads to the variation of electron trajectories and makes electrons leave the current sheet along different paths. If Bz is parallel to Ez, the pitch angles of the accelerated electrons are close to 180°. If Bz is anti-parallel to Ez, the pitch angles of the accelerated electrons are close to 0°. The orientation of the guiding magnetic field just makes the electric field accelerate selectively the electrons in different regions, but does not change the energy distribution of electrons, and the finally derived energy spectrum is the common power-law spectrum E?γ. In typical coronal conditions, γ is about 2.9. The further study indicates that the magnitude of γ depends on the strengths of the guiding magnetic field and reconnecting electric field, as well as the scale of the current sheet. Then, the kinematic characteristics of the accelerated electrons in the current sheet with multiple X-points and O-points are also studied. The result indicates that the existences of the X-points and O-points have the particles constrained in the accelerating region to obtain the maximum acceleration, and the final energy spectrum has the characteristics of multi-power law spectra. |
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