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arXiv 1102.1137astro-ph.SR
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半影细尺度结构消失与Evershed流的时间关系

Temporal Relation between Disappearance of Penumbral Fine-Scale Structure and Evershed Flow

M. Kubo, K. Ichimoto, B. W. Lites, R. A. Shine

摘要:

我们调查的Evershed流,点状明亮的功能(半影颗粒),复杂的磁场结构,和黑暗的通道(暗核心)沿明亮的灯丝在太阳黑子半影之间的时间关系。我们使用的时间序列的高空间分辨率光球强度,矢量磁场地图,多普勒速度地图与太阳光学望远镜搭载的\textit{Hinode}航天器。我们得出的结论是,Evershed流和半影颗粒的出现和消失几乎同时发生,并与磁场的倾斜角从垂直到更水平的变化。这支持了这样的想法,即Evershed流是倾斜场线中的热对流的结果。明亮的半影暗条的暗核似乎也与埃弗谢德气流相一致。然而,在Evershed流消失后,暗芯亮丝至少存活10-20分钟。在Evershed流的热传递结束后,输入到亮丝中的热量继续。这表明,除了通过Evershed流的热传递之外,沿着亮灯丝的局部加热对于保持亮灯丝的亮度是重要的。

英文摘要:

We investigate the temporal relation between the Evershed flow, dot-like bright features (penumbral grain), the complex magnetic field structure, and dark lanes (dark core) along bright filaments in a sunspot penumbra. We use a time series of high spatial resolution photospheric intensity, vector magnetic field maps, and Doppler velocity maps obtained with the Solar Optical Telescope aboard the \textit{Hinode} spacecraft. We conclude that the appearance and disappearance of the Evershed flow and penumbra grains occur at nearly the same time and are associated with changes of the inclination angle of the magnetic field from vertical to more horizontal. This supports the idea that Evershed flow is a result of thermal convection in the inclined field lines. The dark core of the bright penumbral filament also appears coincidental with the Evershed flow. However, the dark-cored bright filament survives at least for 10-20 minutes after the disappearance of the Evershed flow. The heat input into the bright filament continues after the end of heat transfer by the Evershed flow. This suggests that local heating along the bright filament is important to maintain the brightness of the bright filament in addition to the heat transfer by the Evershed flow.

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