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arXiv 0712.3168astro-ph
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从分光偏振观测反演导出的三维太阳黑子模型及其对半影加热的意义

A 3-D sunspot model derived from an inversion of spectropolarimetric observations and its implications for the penumbral heating

C. Beck

摘要:

我推导出一个3-D太阳黑子模型,这是在协议与分光偏振观测,解决问题的半影加热的反复上升的流动通道。我对红外线和可见谱线同时采集的数据进行了反演。我用了两个独立的磁分量来重现半影中不规则的斯托克斯轮廓。我研究了这两种成分的平均和个别性质。通过将场倾角与地表积分,我从反演结果中建立了一个没有内在高度信息的光斑三维模型。我发现,Evershed流是由两个字段组件较弱的窝藏。该组件形成流动通道,其在内部和中间半影中显示上游,在整个半影中水平地继续作为略微升高的环路,并且最终在外部半影中向下弯曲。我发现了几个例子,其中两个或多个流动通道被发现沿径向削减从本影到外边界的斑点。我发现,在静态背景场的水平流动通道的模型是在很好的协议与观察到的光谱。流动通道的性质与Schlichenmaier等人(1998)的模拟非常一致。从强度图像的时间演变和反演中的流动通道的性质,我得出结论,在厚半影上升热通量管的交换对流似乎仍然是一个可能的机制,维持半影能量平衡。

英文摘要:

I deduced a 3-D sunspot model that is in agreement with spectropolarimetric observations, to address the question of penumbral heating by the repetitive rise of flow channels. I performed inversions of data taken simultaneously in infrared and visible spectral lines. I used two independent magnetic components to reproduce the irregular Stokes profiles in the penumbra. I studied the averaged and individual properties of the two components. By integrating the field inclination to the surface, I developed a 3-D model of the spot from inversion results without intrinsic height information. I find that the Evershed flow is harbored by the weaker of the two field components. This component forms flow channels that show upstreams in the inner and mid penumbra, continue horizontally as slightly elevated loops throughout the penumbra, and finally bend down in the outer penumbra. I find several examples, where two or more flow channels are found along a radial cut from the umbra to the outer boundary of the spot. I find that a model of horizontal flow channels in a static background field is in good agreement with the observed spectra. The properties of the flow channels correspond very well to the simulations of Schlichenmaier et al. (1998). From the temporal evolution in intensity images and the properties of the flow channels in the inversion, I conclude that interchange convection of rising hot flux tubes in a thick penumbra still seems a possible mechanism for maintaining the penumbral energy balance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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