色球磁重联：聚结电流回路的双流体模拟
Chromospheric magnetic reconnection: Two-fluid simulations of coalescing current loops
摘要：
目的：通过改变中性氢与质子密度比、电离/复合系数、碰撞频率和环的相对螺旋度，研究太阳色球层中两个电流回路合并期间的磁重联率。方法：利用新开发的离子-中性双流体数值程序对色球层进行了2.5维数值模拟。从人工风计划，数字代码包括离子中性碰撞，电离/复合，热/电阻扩散和碰撞/电阻加热的影响。结果如下：结果发现，磁重联的速率强烈地依赖于中性氢与质子的密度比;密度比增加一千倍，磁重联的速率降低二十倍。这一结果意味着，在离子（质子）和中性氢密度相当的上色球层中，磁重联的速度明显快于中性氢密度超过离子密度1000倍的下色球层。电离/复合是色球层中的一个重要物理效应，它增加了总重联磁通量，但不改变磁重联的速率。离子-中性粒子碰撞频率的降低，导致磁重联速率的小幅增加。没有观察到两个电流回路的相对螺旋度对磁重联的速率有任何显著影响。结论：中性氢粒子的存在对聚结电流回路的磁重联率有很大的影响。
英文摘要：
Aims: To investigate magnetic reconnection rates during the coalescence of two current loops in the solar chromosphere, by altering the neutral-hydrogen to proton density ratio, ioniziation/recombination coefficients, collision frequency and relative helicity of the loops. Methods: 2.5D numerical simulations of the chromosphere were conducted using a newly developed two-fluid (ion-neutral) numerical code. Developed from the Artificial Wind scheme, the numerical code includes the effects of ion-neutral collisions, ionization/recombination, thermal/resistive diffusivity and collisional/resistive heating. Results: It was found that the rates of magnetic reconnection strongly depend on the neutral-hydrogen to proton density ratio; increasing the density ratio by a thousand-fold decreased the rate of magnetic reconnection by twenty-fold. This result implies that magnetic reconnection proceeds significantly faster in the upper chromosphere, where the density of ions (protons) and neutral-hydrogen is comparable, than in the lower chromosphere where the density of neutral-hydrogen is over a thousand times the ion density. The inclusion of ionization/recombination, an important physics effect in the chromosphere, increases the total reconnected magnetic flux, but does not alter the rate of magnetic reconnection. Reductions in the ion-neutral collision frequency, result in small increases to the rates of magnetic reconnection. The relative helicity of the two current loops was not observed to have any significant effect on the rates of magnetic reconnection. Conclusions: The magnetic reconnection rates of coalescing current loops are strongly affected by the inclusion of neutral-hydrogen particles.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
