Near-infrared spectropolarimetry of a δ-spot

Near-infrared spectropolarimetry of a δ-spot
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Ύ´ 点的近红外光谱偏振法

DOI:
10.1051/0004-6361/201323224
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发表时间:
2014
影响因子:
6.5
通讯作者:
Denker
Denker
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Balthasar;Denker

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在同一个半影(δ斑)内有两个磁极性本影的太阳黑子通常但不总是与耀斑有关。2012年6月17日,我们在特内里费岛的真空塔望远镜上使用特内里费岛红外偏振仪获得了第一个近红外观测(Fe iλ1078.3 nm和Si iλ1078.6 nm光谱),这提供了精确和灵敏的诊断,以仔细检查活动区域NOAA 11504内δ斑磁中性线沿着的复杂场。我们研究了这个相当不活跃的δ斑的矢量磁场、视线(LOS)速度和水平自行。我们发现磁矢量场从主本影到相反极性(δ本影)的平滑过渡,但在距δ本影一定距离处的极性反转线上,水平磁场不连续。在δ本影以上,磁场随高度的增加而减小,减小速度为原来的2倍。后者被其自身的Evershed流所包围。来自主本影的埃弗谢德流在将点分成两部分的线处结束。这条线的标志是在Ca iiλ854.2 nm线中出现中心发射。沿着这条线,出现了两种符号的高色球层LOS速度。我们检测到的剪切流内的水平通量输送速度平行于分界线。
Sunspots harboring umbrae of both magnetic polarities within a common penumbra (δ-spots) are often but not always related to flares. We present first near-infrared observations (Fe iλ1078.3 nm and Si iλ1078.6 nm spectra) obtained with the Tenerife Infrared Polarimeter at the Vacuum Tower Telescope in Tenerife on 2012 June 17, which afford accurate and sensitive diagnostics to scrutinize the complex fields along the magnetic neutral line of aδ-spot within active region NOAA 11504. We examined the vector magnetic field, line-of-sight (LOS) velocities, and horizontal proper motions of this rather inactiveδ-spot. We find a smooth transition of the magnetic vector field from the main umbra to that of opposite polarity (δ-umbra), but a discontinuity of the horizontal magnetic field at some distance from theδ-umbra on the polarity inversion line. The magnetic field decreases faster with height by a factor of two above theδ-umbra. The latter is surrounded by its own Evershed flow. The Evershed flow coming from the main umbra ends at a line dividing the spot into two parts. This line is marked by the occurrence of central emission in the Ca iiλ854.2 nm line. Along this line, high chromospheric LOS-velocities of both signs appear. We detect a shear flow within the horizontal flux transport velocities parallel to the dividing line.
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