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arXiv 1507.07355astro-ph.SR
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平静太阳光球中的磁上升流事件。I.意见

Magnetic upflow events in the quiet-Sun photosphere. I. Observations

S. Jafarzadeh, L. Rouppe van der Voort, J. de la Cruz Rodriguez

摘要:

最近,在太阳静止光球层中的快速磁上升流被发现来自于日出/IMaX和Hinode/SOT的观测。在这里,我们研究磁上流事件(MUE)从高品质,高(空间,时间和光谱)分辨率,并在四个光球磁敏感Fe I线集中在525.021,617.334,630.151,和630.250 nm与瑞典太阳望远镜(SST)/CRISP获得全斯托克斯观测。我们通过从信噪比(S/N)>= 7的远蓝翼中的那些信号中减去在线Stokes V信号来检测MUE。我们发现,在任何给定的时间(0.02每平方角秒),由一个到两个数量级,比以前报道的更大的MUE的数量。MUE似乎分为四类,呈现不同形状的斯托克斯V剖面,(I)不对称的双瓣,(II)单瓣,(III)双峰(两个相同极性的瓣),和(IV)三瓣(除了双瓣外,还有一个额外的蓝移凸块),其中不到一半是单瓣。我们还发现,MUE几乎均匀地分布在网络和网络间的区域,他们出现在内部或在这两个区域的颗粒的边缘。除了水平速度的分布外,MUE的物理性质(即Stokes V信号、大小、视线速度和寿命)的分布对于我们数据中的不同谱线几乎是相同的。我们的光谱分辨观测的平分线分析表明,这些事件主机适度的上升流,并没有显示出直接的迹象存在的超音速上升流之前报道。我们的研究结果表明,数量,类型(类),并确定为MUE的属性可以在很大程度上取决于所使用的检测技术和所采用的数据,即S/N,分辨率和波长的属性。

英文摘要:

Rapid magnetic upflows in the quiet-Sun photosphere were recently uncovered from both SUNRISE/IMaX and Hinode/SOT observations. Here, we study magnetic upflow events (MUEs) from high-quality, high- (spatial, temporal, and spectral) resolution, and full Stokes observations in four photospheric magnetically sensitive Fe I lines centered at 525.021, 617.334, 630.151, and 630.250 nm acquired with the Swedish Solar Telescope (SST)/CRISP. We detect MUEs by subtracting in-line Stokes V signals from those in far blue wing whose signal-to-noise ratio (S/N) >= 7. We find a larger number of MUEs at any given time (0.02 per square arcsec), larger by one to two orders of magnitude, than previously reported. The MUEs appear to fall into four classes presenting different shapes of Stokes V profiles with (I) asymmetric double lobes, (II) single lobes, (III) double-humped (two same-polarity lobes), and (IV) three lobes (an extra blue-shifted bump in addition to double-lobes), of which less than half are single-lobed. We also find that MUEs are almost equally distributed in network and internetwork areas and they appear in the interior or at the edge of granules in both regions. Distributions of physical properties, except that of horizontal velocity, of the MUEs (namely, Stokes V signal, size, line-of-sight velocity, and lifetime) are almost identical for the different spectral lines in our data. A bisector analysis of our spectrally resolved observations shows that these events host modest upflows and do not show direct indication of the presence of supersonic upflows reported earlier. Our findings reveal that numbers, types (classes), and properties determined for MUEs can strongly depend on the detection techniques used and the properties of the employed data, namely, S/Ns, resolutions, and wavelengths.

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