Lukin Vyacheslav S, Khomenko Elena, Popescu Braileanu Beatrice
US National Science Foundation, Alexandria, VA 22306, USA.
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain.
Philos Trans A Math Phys Eng Sci. 2024 Jun 9;382(2272):20230417. doi: 10.1098/rsta.2023.0417. Epub 2024 Apr 25.
This study explores nonlinear development of the magnetized Rayleigh-Taylor instability (RTI) in a prominence-corona transition region. Using a two-fluid model of a partially ionized plasma, we compare RTI simulations for several different magnetic field configurations. We follow prior descriptions of the numerical prominence model (Popescu Braileanu 2021 , A93 (doi:10.1051/0004-6361/202039053), Popescu Braileanu 2021 , A181 (doi:10.1051/0004-6361/202140425) and Popescu Braileanu 2023 , A31 (doi:10.1051/0004-6361/202142996)) and explore the charged-neutral fluid coupling and plasma heating in a two-dimensional mixing layer for different magnetic field configurations. We also investigate how the shear in magnetic field surrounding a prominence may impact the release of the gravitational potential energy of the prominence material. We show that the flow decoupling is strongest in the plane normal to the direction of the magnetic field, where neutral pressure gradients drive ion-neutral drifts and frictional heating is balanced by adiabatic cooling of the expanding prominence material. We also show that magnetic field within the mixing plane can lead to faster nonlinear release of the gravitational energy driving the RTI, while more efficiently heating the plasma via viscous dissipation of associated plasma flows. We relate the computational results to potential observables by highlighting how integrating over under-resolved two-fluid sub-structure may lead to misinterpretation of observational data. This article is part of the theme issue 'Partially ionized plasma of the solar atmosphere: recent advances and future pathways'.
本研究探讨了日珥 - 日冕过渡区中磁化瑞利 - 泰勒不稳定性（RTI）的非线性发展。使用部分电离等离子体的双流体模型，我们比较了几种不同磁场构型下的RTI模拟。我们遵循先前对数值日珥模型的描述（波佩斯库·布拉耶亚努，2021年，A93（doi:10.1051/0004 - 6361/202039053），波佩斯库·布拉耶亚努，2021年，A181（doi:10.1051/0004 - 6361/202140425）以及波佩斯库·布拉耶亚努，2023年，A31（doi:10.1051/0004 - 6361/202142996）），并研究了不同磁场构型下二维混合层中的带电 - 中性流体耦合和等离子体加热。我们还研究了日珥周围磁场中的剪切如何影响日珥物质引力势能的释放。我们表明，在垂直于磁场方向的平面中，流动解耦最强，其中中性压力梯度驱动离子 - 中性漂移且摩擦加热由膨胀的日珥物质绝热冷却平衡。我们还表明，混合平面内的磁场可导致驱动RTI的引力能更快地非线性释放，并通过相关等离子体流的粘性耗散更有效地加热等离子体。我们通过强调对未充分解析的双流体子结构进行积分如何可能导致对观测数据误解，将计算结果与潜在观测结果联系起来。本文是主题为“太阳大气的部分电离等离子体：最新进展与未来路径”的一部分。
