Solar Chromospheric Network as a Source for Solar Wind Switchbacks
Solar Chromospheric Network as a Source for Solar Wind Switchbacks
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DOI：
10.3847/2041-8213/ac86bf
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发表时间：
2022-08
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影响因子：
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通讯作者：
Jeongwoo Lee;V. Yurchyshyn;Haimin Wang;Xu Yang;W. Cao;Juan Carlos Martínez Oliveros
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作者：
Jeongwoo Lee;V. Yurchyshyn;Haimin Wang;Xu Yang;W. Cao;Juan Carlos Martínez Oliveros
最近的研究表明，帕克太阳探测器探测到的磁之字形（SB）携带着太阳超颗粒（大尺度）和颗粒（中等尺度）尺度的信息。我们使用大熊太阳天文台古德太阳望远镜的可见光分光偏振仪获得的高分辨率Hα图像来验证这一说法。作为可能的太阳源，我们计算了在Hα蓝翼图像中可见但在红翼图像中看不到的、沿沿着冕洞边界附近色球网络的所有针状特征，并测量了单个通量管密集部分的几何参数。沿色球网络沿着分布的针状体间距在0.4-1.5 μ m（0.03 ~ 0.12 °）之间，小于中等尺度的SB。所有通量管对之间的间距也被计算，它们出现在一个单峰分布在0.7微米（0.0 °06）附近，而不是在无标度的单一幂律形式的SB的等待时间分布。通量管密集段的长径比高达6-40，与SB的长径比相似。沿着网络的针状物的数量沿着可以高达40-100，与补丁内的许多SB一致。有了这些数字，有人认为，中等规模的SB可以被理解为一个平衡的距离，从一个随机行走在每个分散的磁场漏斗连接到色球网络。
Recent studies suggest that the magnetic switchbacks (SBs) detected by the Parker Solar Probe carry information on the scales of solar supergranulation (large scale) and granulation (medium scale). We test this claim using high-resolution Hα images obtained with the visible spectropolarimeters of the Goode Solar Telescope in Big Bear Solar Observatory. As possible solar sources, we count all the spicule-like features standing along the chromospheric networks near the coronal hole boundary visible in the Hα blue-wing but absent in the red-wing images and measure the geometric parameters of dense sections of individual flux tubes. Intervals between adjacent spicules located along the chromospheric networks are found in the range of 0.4–1.5 Mm (0.°03–0.°12) tending to be smaller than the medium scale of SBs. Interdistances between all pairs of the flux tubes are also counted and they appear in a single peak distribution around 0.7 Mm (0.°06) unlike the waiting-time distribution of SBs in a scale-free single power-law form. The length-to-diameter ratio of the dense section of flux tubes is as high as 6–40, similar to the aspect ratio of SBs. The number of spicules along a network can be as high as 40–100, consistent with numerous SBs within a patch. With these numbers, it is argued that the medium scale of SBs can be understood as an equilibrium distance resulting from a random walk within each diverging magnetic field funnel connected to the chromospheric networks.