PARTICLE ACCELERATION IN FRAGMENTING PERIODIC RECONNECTING CURRENT SHEETS IN SOLAR FLARES
PARTICLE ACCELERATION IN FRAGMENTING PERIODIC RECONNECTING CURRENT SHEETS IN SOLAR FLARES
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DOI：
10.1088/0004-637x/720/2/1603
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
M. Gordovskyy;P. K. Browning;G. Vekstein
中科院分区：
文献类型：
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作者：
M. Gordovskyy;P. K. Browning;G. Vekstein
基于强制磁重联场景，研究了碎片化周期性电流片 (CS) 中的质子和电子加速。目的是了解 CS 碎片在太阳耀斑高能光束产生中的作用。我们结合磁流体动力学和测试粒子模型来考虑与时间相关重联模型一致的粒子轨迹。结果表明，这种模型中的加速粒子形成两个不同的种群。在开放磁场中运动的质子和电子的能谱是初始麦克斯韦分布和幂律高能（E>20 keV）部分的组合。第二群包含在 O 点周围的闭合磁场中移动的粒子。这些粒子主要沿着引导场移动，它们的能量落在~1 MeV 和~10 MeV 之间的相当窄的范围内。研究还发现，在开放磁场中运动的粒子具有相当宽的俯仰角分布。
Proton and electron acceleration in a fragmenting periodic current sheet (CS) is investigated, based on the forced magnetic reconnection scenario. The aim is to understand the role of CS fragmentation in high-energy beam generation in solar flares. We combine magnetohydrodynamics and test-particle models to consider particle trajectories consistent with a time-dependent reconnection model. It is shown that accelerated particles in such a model form two distinct populations. Protons and electrons moving in open magnetic field have energy spectra that are a combination of the initial Maxwellian distribution and a power-law high-energy (E>20 keV) part. The second population contains particles moving in a closed magnetic field around O-points. These particles move predominantly along the guiding field and their energies fall within quite a narrow range between ∼1 MeV and ∼10 MeV. It is also found that particles moving in an open magnetic field have a considerably wider pitch-angle distribution.