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首页> 外文期刊>The Astrophysical Journal. Letters >Diffusion of solar magnetic elements up to supergranular spatial and temporal scales
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Diffusion of solar magnetic elements up to supergranular spatial and temporal scales

机译:太阳磁性元素的扩散直至超颗粒的时空尺度

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摘要

The study of spatial and temporal scales on which small magnetic structures (magnetic elements) are organized in the quiet Sun may be approached by determining how they are transported on the solar photosphere by convective motions. The process involved is diffusion. Taking advantage of Hinode high spatial resolution magnetograms of a quiet-Sun region at the disk center, we tracked 20,145 magnetic elements. The large field of view (~50 Mm) and the long duration of the observations (over 25 hr without interruption at a cadence of 90 s) allowed us to investigate the turbulent flows at unprecedented large spatial and temporal scales. In the field of view an entire supergranule is clearly recognizable. The magnetic element displacement spectrum shows a double-regime behavior: superdiffusive (γ = 1.34 ± 0.02) up to granular spatial scales (~1500 km) and slightly superdiffusive (γ = 1.20 ± 0.05) up to supergranular scales.
机译:可以通过确定对流运动来研究小磁性结构(磁性元素)在安静的太阳下的组织方式在空间和时间尺度上的研究。涉及的过程是扩散。利用磁盘中心的一个安静太阳区域的Hinode高空间分辨率磁图,我们跟踪了20145个磁性元素。广阔的视野(〜50 Mm)和长时间的观测(超过25小时,以90 s的节奏无间断)使我们能够以前所未有的大时空尺度研究湍流。在视野中,可以清楚地识别出整个超级颗粒。磁性元素位移谱显示出一种双态行为:在颗粒空间尺度(〜1500 km)内为超扩散(γ= 1.34±0.02),在颗粒粒度为最高颗粒时,呈超扩散(γ= 1.20±0.05)。

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