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arXiv 0909.3310astro-ph.SR
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太阳超颗粒的强度分布

The Intensity Profile of the Solar Supergranulation

N. J. Goldbaum, M. P. Rast, I. Ermolli, J. S. Sands, F. Berrilli

摘要:

我们已经测量了平均径向(细胞中心到网络边界)的连续强度对比度与超颗粒流使用的数据从精密太阳光度望远镜(PSPT)在莫纳罗亚太阳天文台(MLSO)。通过应用基于Ca II K强度的掩膜去除网络通量元素的贡献,并对超过10^5个超颗粒细胞进行平均,我们发现从超颗粒细胞中心向外,红色和蓝色连续强度降低了约0.1%,对应于整个细胞的亮温降低了约1.0 K。径向强度分布可能是由与超颗粒流相关的热信号或未分辨磁通量元素的堆积密度的变化引起的。这些都没有明确区分的意见,我们提出的可能性,网络磁场发挥积极的作用,在超颗粒尺度的选择,通过增强辐射冷却的深光球在细胞边界。

英文摘要:

We have measured the average radial (cell center to network boundary) profile of the continuum intensity contrast associated with supergranular flows using data from the Precision Solar Photometric Telescope (PSPT) at the Mauna Loa Solar Observatory (MLSO). After removing the contribution of the network flux elements by the application of masks based on Ca II K intensity and averaging over more than 10^5 supergranular cells, we find a ~ 0.1% decrease in red and blue continuum intensity from the supergranular cell centers outward, corresponding to a ~ 1.0 K decrease in brightness temperature across the cells. The radial intensity profile may be caused either by the thermal signal associated with the supergranular flows or a variation in the packing density of unresolved magnetic flux elements. These are not unambiguously distinguished by the observations, and we raise the possibility that the network magnetic fields play an active role in supergranular scale selection by enhancing the radiative cooling of the deep photosphere at the cell boundaries.

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