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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Nonlinear instability and intermittent nature of magnetic reconnection in solar chromosphere
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Nonlinear instability and intermittent nature of magnetic reconnection in solar chromosphere

机译：太阳色球中磁重联的非线性不稳定性和间歇性

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The recent observations of Singh et al. (2012, ApJ, 759, 33) have shown multiple plasma ejections and the intermittent nature of magnetic reconnection in the solar chromosphere, highlighting the need for fast reconnection to occur in highly collisional plasma. However, the physical process through which fast magnetic reconnection occurs in partially ionized plasma, like the solar chromosphere, is still poorly understood. It has been shown that for sufficiently high magnetic Reynolds numbers, Sweet-Parker current sheets can become unstable leading to tearing mode instability and plasmoid formation, but when dealing with a partially ionized plasma the strength of coupling between the ions and neutrals plays a fundamental role in determining the dynamics of the system. We propose that as the reconnecting current sheet thins and the tearing instability develops, plasmoid formation passes through strongly, intermediately, and weakly coupled (or decoupled) regimes, with the time scale for the tearing mode instability depending on the frictional coupling between ions and neutrals. We present calculations for the relevant time scales for fractal tearing in all three regimes. We show that as a result of the tearing mode instability and the subsequent non-linear instability due to the plasmoid-dominated reconnection, the Sweet-Parker current sheet tends to have a fractal-like structure, and when the chromospheric magnetic field is sufficiently strong the tearing instability can reach down to kinetic scales, which are hypothesized to be necessary for fast reconnection.
机译：Singh等人的最新观察。 （2012，ApJ，759，33）显示了多次等离子体喷射以及太阳色球层中磁重连接的间歇性，强调了在高度碰撞的等离子体中需要快速重连接的问题。但是，对于像太阳色球这样的部分电离的等离子体中发生快速磁重新连接的物理过程，仍然知之甚少。研究表明，对于足够高的雷诺数，Sweet-Parker电流片会变得不稳定，从而导致撕裂模式不稳定性和等离子体形成，但是当处理部分电离的等离子体时，离子和中性离子之间的耦合强度起着根本性的作用。在确定系统的动力学方面。我们建议，随着重新连接的电流板变薄和撕裂不稳定性的发展，等离子体的形成会经历强，中和弱耦合（或解耦）状态，而撕裂模式不稳定性的时间尺度取决于离子与中性物之间的摩擦耦合。我们提出了在所有三种情况下分形撕裂的相关时间尺度的计算。我们表明，由于撕裂模式的不稳定性以及随后因等离子体主导的重新连接而引起的非线性不稳定性，Sweet-Parker电流片趋向于具有分形结构，并且当色球磁场足够强时撕裂的不稳定性可以降低到动力学尺度，这被认为是快速重新连接所必需的。

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