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首页> 外文期刊>The Astrophysical journal >OBSERVATIONS OF AN ENERGETICALLY ISOLATED QUIET SUN TRANSIENT: EVIDENCE OF QUASI-STEADY CORONAL HEATING
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OBSERVATIONS OF AN ENERGETICALLY ISOLATED QUIET SUN TRANSIENT: EVIDENCE OF QUASI-STEADY CORONAL HEATING

机译:能量隔离的安静太阳瞬变的观测:准稳态冕状加热的证据

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摘要

Increasing evidence for coronal heating contributions from cooler solar atmospheric layers, notably quiet Sun (QS) conditions, challenges standard solar atmospheric descriptions of bright transition region (TR) emission. As such, questions about the role of dynamic QS transients in contributing to the total coronal energy budget are raised. Using observations from the Atmospheric Imaging Assembly and Heliosemic Magnetic Imager on board the Solar Dynamics Observatory, and numerical model extrapolations of coronal magnetic fields, we investigate a dynamic QS transient that is energetically isolated to the TR and extrudes from a common footpoint shared with two heated loop arcades. A non-causal relationship is established between episodic heating of the QS transient and widespread magnetic field re-organization events, while evidence is found favoring a magnetic topology that is typical of eruptive processes. Quasi-steady interchange reconnection events are implicated as a source of the transient's visibly bright radiative signature. We consider the QS transient's temporally stable (≈35 minutes) radiative nature to occur as a result of the large-scale magnetic field geometries of the QS and/or relatively quiet nature of the magnetic photosphere, which possibly act to inhibit energetic build-up processes that are required to initiate a catastrophic eruption phase. This work provides insight into the QS's thermodynamic and magnetic relation to eruptive processes that quasi-steadily heat a small-scale dynamic and TR transient. This work explores arguments of non-negligible coronal heating contributions from cool atmospheric layers in QS conditions and contributes evidence to the notion that? solar wind mass feeds off of dynamic transients therein.
机译:较凉爽的太阳大气层(特别是安静的太阳(QS)条件)对日冕加热的贡献的证据越来越多,对明亮的过渡区域(TR)排放的标准太阳大气描述提出了挑战。因此,提出了有关动态QS瞬变在总日冕能量预算中的作用的问题。利用来自太阳动力学天文台上的大气成像组件和Heliosemic电磁成像仪的观测结果以及日冕磁场的数值模型外推,我们研究了一个动态QS瞬变,该瞬态QS瞬变与TR隔离,并从与两个加热点共享的共同脚点挤出循环街机。在QS瞬变的间歇加热和广泛的磁场重组事件之间建立了非因果关系,同时发现证据支持了喷发过程中典型的磁拓扑。拟稳定交换重新连接事件与瞬态的可见光辐射特征有关。我们认为QS瞬变的时间稳定(≈35分钟)的辐射性质是由于QS的大规模磁场几何形状和/或磁光球相对较安静的性质而产生的,这可能会抑制高能积累启动灾难性喷发阶段所需的过程。这项工作深入了解了QS与准稳定加热小规模动态和TR瞬变的喷发过程的热力学和磁关系。这项工作探讨了在QS条件下来自凉爽大气层的日冕加热的贡献不可忽略的论点,并为以下观点提供了证据:太阳风的质量来自其中的动态瞬变。

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