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arXiv 1010.6041astro-ph.SR
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赤道和极地太阳光球和色球层磁场的比较研究

A Comparative Study of Magnetic Fields in the Solar Photosphere and Chromosphere at Equatorial and Polar Latitudes

Gordon J. D. Petrie, Irina Patrikeeva

摘要:

除了他们自己的内在利益,正确解释太阳表面磁场观测是至关重要的,我们的能力,以描述全球的太阳大气磁结构。在日冕模型中,光球磁图常被用作下边界条件,而不是来自几乎没有力的色球层的数据。国家太阳观测台的太阳天气光学长期研究矢量分光磁仪每天从光球层和色球层产生全圆盘视线磁通量图像。在本文中,我们调查的关键属性的磁场在这两个层使用超过五年的VSM数据。我们从近赤道测量中发现,大多数光球场的东西倾角小于12°,而色球场在所有方向上都有很大程度的扩展。使用一个简单的立体反演,我们发现的证据表明,光球极场也接近径向,但在2008年期间,色球场在南极超径向扩大。我们得到了一个空间分辨的极区光球通量分布,直到80°纬度,其强度向极方向增加,近似为余弦(余纬度)的9-10次方。该分布将给出5-6 G的极场强。我们简要讨论了未来天气图的建设和建模的影响。

英文摘要:

Besides their own intrinsic interest, correct interpretation of solar surface magnetic field observations is crucial to our ability to describe the global magnetic structure of the solar atmosphere. Photospheric magnetograms are often used as lower boundary conditions in models of the corona, but not data from the nearly force-free chromosphere. National Solar Observatory's (NSO) Synoptic Optical Long-term Investigations of the Sun VSM (Vector Spectromagnetograph) produces full-disk line-of-sight magnetic flux images deriving from both photospheric and chromospheric layers on a daily basis. In this paper, we investigate key properties of the magnetic field in these two layers using more than five years of VSM data. We find from near-equatorial measurements that the east-west inclination angle of most photospheric fields is less than about 12°, while chromospheric fields expand in all directions to a significant degree. Using a simple stereoscopic inversion, we find evidence that photospheric polar fields are also nearly radial but that during 2008 the chromospheric field in the south pole was expanding superradially. We obtain a spatially resolved polar photospheric flux distribution up to 80° latitude whose strength increases poleward approximately as cosine(colatitude) to the power 9-10. This distribution would give a polar field strength of 5-6 G. We briefly discuss implications for future synoptic map construction and modeling.

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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