具有非局部热输运的燃烧环的热力学演化

S. Belov, T. Parmenter, T. Arber, D. Kolotkov, F. Reale and T. Goffrey
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引用次数: 0

摘要

热的太阳日冕环,如耀斑环,达到的温度使热输运变得非局部。当不能再假设电子的平均自由程很小时,就会发生这种情况。利用Lare2d代码的修改版本,我们研究了三种热输运模型下耀斑加热日冕环的演化:经典Spitzer-Härm (SH),通量限制(FL)局部模型和非局部Schurtz-Nicolaï-Busquet (SNB)模型。SNB模型广泛应用于激光等离子体研究。它已经与精确的非局部Vlasov-Fokker-Planck模型进行了基准测试,并被证明是可以应用于流体时间尺度的最精确的非局部模型。对环顶附近的密度-温度演化周期的分析揭示了SNB模式比局部模式具有更高温度和更低密度的独特演化路径。在能量沉积过程中,由于热通量抑制,SNB模型在顶点产生一个更局部和强烈的温度峰,这也减少了色球蒸发,导致耀斑后密度降低。极紫外发射合成表明,SNB模型产生的耀斑光曲线具有较低的峰值振幅和更平滑的衰减相位。我们还发现非局部输运影响平衡环条件,产生更热和更稀薄的顶点。这些发现强调了在动态太阳现象中考虑非局部传导的必要性,并强调了SNB模型在提高耀斑模拟真实性方面的潜力。FL传导模型不能再现SNB模型所涵盖的非局部输运结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermodynamic Evolution of Flaring Loops with Nonlocal Thermal Transport
Hot solar coronal loops, such as flaring loops, reach temperatures where the thermal transport becomes nonlocal. This occurs when the mean-free-path of electrons can no longer be assumed to be small. Using a modified version of the Lare2d code, we study the evolution of flare-heated coronal loops under three thermal transport models: classical Spitzer–Härm (SH), a flux-limited (FL) local model, and the nonlocal Schurtz–Nicolaï–Busquet (SNB) model. The SNB model is used extensively in laser-plasma studies. It has been benchmarked against accurate nonlocal Vlasov–Fokker–Planck models and proven to be the most accurate nonlocal model that can be applied on fluid timescales. Analysis of the density–temperature evolution cycles near the loop apex reveals a distinct evolutionary path for the SNB model, with higher temperatures and lower densities than local models. During energy deposition, the SNB model produces a more localized and intense temperature peak at the apex due to heat flux suppression, which also reduces chromospheric evaporation and results in lower postflare densities. Extreme-ultraviolet emission synthesis shows that the SNB model yields flare light curves with lower peak amplitudes and smoother decay phases. We also find that nonlocal transport affects equilibrium loop conditions, producing hotter and more rarefied apexes. These findings emphasize the need to account for nonlocal conduction in dynamic solar phenomena and highlight the potential of the SNB model for improving the realism of flare simulations. FL conduction models cannot reproduce the results of nonlocal transport covered by the SNB model.
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