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Signatures of Alfvén waves in the polar coronal holes as seen by EIS/Hinode

机译：EIS / Hinode观测到极冠孔中的Alfvén波的特征

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Context. We diagnose the properties of the plume and interplume regions in a polar coronal hole and the role of waves in the acceleration of the solar wind. Aims. We attempt to detect whether Alfvén waves are present in the polar coronal holes through variations in EUVline widths. Methods. Using spectral observations performed over a polar coronal hole region with the EIS spectrometer on Hinode, we study the variation in the line width and electron density as a function of height. We use the density sensitive line pairs of Fe XII186.88? and 195.119? and Fe XIII203.82? and 202.04?. Results. For the polar region, the line width data show that the nonthermal line-of-sight velocity increases from at10above the limb to some 150(i.e.110000km) above the limb. The electron density shows a decrease from 3.3to 1.9over the same distance. Conclusions. These results imply that the nonthermal velocity is inversely proportional to the quadratic root of the electron density, in excellent agreement with what is predicted for undamped radially propagating linear Alfvénwaves. Our data provide signatures of Alfvénwaves in the polar coronal hole regions, which could be important for the acceleration of the solar wind. Key words: Sun: corona - Sun: oscillations - Sun: UV radiation - line: profiles - waves
机译：上下文。我们诊断了极地冠状孔中羽流和互层区域的性质，以及波在加速太阳风中的作用。目的我们试图通过EUVline宽度的变化来检测极冠孔中是否存在Alfvén波。方法。使用在Hinode上的EIS光谱仪在极冠孔区域进行的光谱观察，我们研究了线宽和电子密度随高度的变化。我们使用Fe XII186.88的密度敏感线对吗？和195.119？和Fe XIII203.82？和202.04 ？。结果。对于极地地区，线宽数据表明，非热视线速度从肢体上方的10增加到肢体上方的150（即110000 km）。在相同距离上，电子密度从3.3降低到1.9。结论。这些结果表明，非热速度与电子密度的平方根成反比，这与对非阻尼径向传播线性Alfvénwave的预测非常一致。我们的数据提供了极地冠状孔区域中Alfvénwave的特征，这对于加速太阳风很重要。关键词：太阳：日冕-太阳：振荡-太阳：紫外线辐射-线：轮廓-波

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