Particle acceleration in a transient magnetic reconnection event
Particle acceleration in a transient magnetic reconnection event
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DOI：
10.1051/0004-6361/200913569
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发表时间：
2010-09
影响因子：
6.5
通讯作者：
M. Gordovskyy;P. Browning;G. Vekstein
中科院分区：
文献类型：
--
作者：
M. Gordovskyy;P. Browning;G. Vekstein
上下文本文研究了太阳耀斑中直接电场对粒子的加速作用。目标。质子和电子动力学被认为是磁重联的MHD模拟的基础上，与时间相关的重联事件模型中确定加速粒子的属性的目的。方法.首先，我们考虑了几种在初始无力的Harris电流片中强迫重联的二维数值模型。从这些模型的电场和磁场，然后被用来研究质子和电子的运动与指导中心，测试粒子的方法。结果它表明，质子和电子可以被加速到非常高的能量高达几十兆电子伏在本模型。这两种粒子的能谱是指数和相当硬的幂律形状的组合。此外，质子和电子从CS以不同的方向射出。
Context. In the present paper, we investigate particle acceleration by direct electric field in solar flares. Aims. Proton and electron kinetics are considered based on MHD simulations of magnetic reconnection, with the aim of determining the properties of accelerated particles in a time-dependent reconnecting event model. Methods. At first, we considered several two-dimensional numerical models of forced reconnection in the initially force-free Harris current sheet. The electric and magnetic fields from these models were then used to study proton and electron motion with the guiding centre, test particle approach. Results. It is shown that protons and electrons can be accelerated to very high energies up to tens of MeV in the present model. The energy spectra for both particle species are combinations of exponential and rather hard power-law shapes. Also, protons and electrons are ejected from the CS in different directions.