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Relaxation and Heating Triggered by Nonlinear Kink Instability: Application to Solar Flares and Coronal Heating

机译：非线性扭结不稳定性触发的弛豫和加热：在太阳耀斑和日冕加热中的应用

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摘要

Energy release and particle acceleration in kink-unstable twisted coronal loops are discussed. If the magnetic field in a coronal loop is sufficiently strongly twisted, it may become unstable to the ideal kink instability. We present results of 3D MHD simulations which show that in the nonlinear phase of the instability, current sheets form in which magnetic reconnection rapidly dissipates magnetic energy. In the later phase, the current sheet fragments. The energy release is well-modelled by a helicity conserving relaxation to a minimum energy state. We exploit this in order to calculate a distribution of energy-release events, and show how this is relevant to the solar coronal heating problem. Using test particle approach coupled with 3D MHD simulations, we also show how the electric fields associated with the fragmented currents sheet can efficiently accelerate charged particles. This has implications for the origin of high-energy particles in solar flares.
机译：讨论了扭结不稳定的日冕环中的能量释放和粒子加速。如果冠状环中的磁场发生足够强的扭曲，则对于理想的扭结不稳定性可能会变得不稳定。我们提供了3D MHD仿真的结果，该结果表明，在不稳定的非线性阶段，形成了电流表，在该电流表中，磁连接迅速消散了磁能。在后面的阶段中，当前工作表会碎裂。通过将松弛保持到最小能量状态的螺旋度很好地模拟了能量释放。我们利用这一点来计算能量释放事件的分布，并说明这与太阳日冕加热问题有何关系。使用测试粒子方法和3D MHD模拟，我们还展示了与碎片电流表相关的电场如何有效地加速带电粒子。这对太阳耀斑中高能粒子的起源有影响。

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