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MAGNETIC UPFLOW EVENTS IN THE QUIET-SUN PHOTOSPHERE. I. OBSERVATIONS

机译:安静的太阳光球中的磁通量事件。一,观察

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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 5250.21, 6173.34, 6301.51, and 6302.50 ? acquired with the Swedish Solar Telescope (SST)/CRISP. We detect MUEs by subtracting in-line Stokes V signals from those in the far blue wing whose signal-to-noise ratio (S/N) . We find a larger number of MUEs at any given time ( arcsec?2), 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 blueshifted 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 for 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 a direct indication of the presence of supersonic upflows reported earlier. Our findings reveal that the 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.
机译:最近从Sunrise / IMaX和Hinode / SOT观测中都发现了安静的Sun光球中的快速磁流。在这里,我们从高质量,高(空间,时间和光谱)分辨率研究磁上升事件(MUE),并在以5250.21、6173.34、6301.51和6302.50?为中心的四条光球磁敏Fe i线中进行了完整的斯托克斯观测。是通过瑞典太阳望远镜(SST)/ CRISP获得的。我们通过从远蓝翼的信噪比(S / N)中减去那些Stokes V信号来检测MUE。我们发现在任何给定时间(arcsec?2)的MUE数量都比以前报告的要大一到两个数量级。 MUE似乎分为四类,呈现出不同形状的Stokes V轮廓,具有(I)不对称双瓣,(II)单瓣,(III)双驼峰(两个相同极性的瓣)和(IV)三个瓣(除双瓣外,还有一个额外的蓝移凸点),其中不到一半为单瓣。我们还发现,MUE几乎均匀分布在网络和互联网络区域中,并且出现在两个区域的内部或颗粒边缘。 MUE的物理特性(水平速度除外)的分布(即斯托克斯V信号,尺寸,视线速度和寿命)对于我们数据中的不同光谱线几乎相同。对我们的频谱解析观测值进行的平分线分析表明,这些事件仅引起中等程度的上流,而没有直接表明先前报道的超音速上流的存在。我们的发现表明,确定的MUE的数量,类型(类别)和属性可能在很大程度上取决于所使用的检测技术和所使用数据的属性,即S / N,分辨率和波长。

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