Near-IR internetwork spectro-polarimetry at different heliocentric angles
Near-IR internetwork spectro-polarimetry at different heliocentric angles
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DOI：
10.1051/0004-6361:20078500
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发表时间：
2007-10
影响因子：
6.5
通讯作者：
M. M. González-M.;A. Ramos;A. Ariste;R. M. Sainz
中科院分区：
文献类型：
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作者：
M. M. González-M.;A. Ramos;A. Ariste;R. M. Sainz
目标。对太阳表面不同区域的网际网络的近红外光谱偏振数据的分析可能会提供限制，拒绝对这些安静区域进行当前建模。方法：研究方法。我们给出了从圆盘中心到边缘附近1.56微米的FeI线日心角的不同值的非常安静区的偏振光谱观测结果。数据的空间分辨率为0.7−1��。我们分析了斯托克斯分布的直接可观测特性，如圆偏振和线偏振的幅度，以及总的偏振度。还研究了其面积和幅度的不对称性。结果。我们没有发现偏振信号的性质随着日心角的任何显著变化。这意味着，无论太阳圆盘上的位置如何，太阳网络的磁力都保持不变。这一观察事实排除了将网际网络建模为类似网络的场景的可能性。当以我们的空间分辨率观察时，网络间区域的磁性元素似乎呈各向同性分布。
Aims. The analysis of near infrared spectropolarimetric data at the internetwork in different regions on the solar surface could offer constraints that reject current modeling of these quiet areas. Methods. We present spectro-polarimetric observations of very quiet regions for different values of the heliocentric angle for the Fe i lines at 1.56 µm, from disc centre to positions close to the limb. The spatial resolution of the data is 0.7−1 �� . We analyse direct observable properties of the Stokes profiles as the amplitude of circular and linear polarisation, as well as the total degree of polarisation. The area and amplitude asymmetries are also studied. Results. We do not find any significant variation in the properties of the polarimetric signals with the heliocentric angle. This means that the magnetism of the solar internetwork remains the same regardless of the position on the solar disc. This observational fact discards the possibility of modeling the internetwork as a network-like scenario. The magnetic elements of internetwork areas seem to be isotropically distributed when observed at our spatial resolution.