Observational Evidence of S-web Source of the Slow Solar Wind
Observational Evidence of S-web Source of the Slow Solar Wind
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DOI：
10.3847/1538-4357/acc653
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发表时间：
2023-03
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通讯作者：
D. Baker;P. Démoulin;S. Yardley;T. Mihailescu;L. Driel-Gesztelyi;R. D’Amicis;D. Long;A. To;C. Owen;T. Horbury;D. Brooks;D. Perrone;R. French;A. James;M. Janvier;S. Matthews;M. Stangalini;G. Valori;P. Smith;R. A. Cuadrado;H. Peter;U. Schuehle;L. Harra;Krzysztof Barczynski;D. Berghmans;A. Zhukov;L. Rodriguez;C. Verbeeck
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作者：
D. Baker;P. Démoulin;S. Yardley;T. Mihailescu;L. Driel-Gesztelyi;R. D’Amicis;D. Long;A. To;C. Owen;T. Horbury;D. Brooks;D. Perrone;R. French;A. James;M. Janvier;S. Matthews;M. Stangalini;G. Valori;P. Smith;R. A. Cuadrado;H. Peter;U. Schuehle;L. Harra;Krzysztof Barczynski;D. Berghmans;A. Zhukov;L. Rodriguez;C. Verbeeck
从2022年3月18日至21日，NOAA活动区（AR）12967由太阳轨道器在0.35 Au和Hinode/EIS在地球上同时跟踪。在此期间，观察到强烈的蓝移等离子体上升沿沿着薄，黑暗的走廊开放的磁场起源于AR的领先的极性，并继续向南延伸的北方极地冕洞。位场源表面模型显示了开放磁场沿走廊沿着的大的横向扩展。大尺度拓扑结构的挤压因子Q图进一步证实了超径向膨胀，支持慢风的S-网络理论。上升气流的狭窄走廊被认为是一个缓慢的太阳风气流的来源区域，其特征是速度为300 km s−1，质子温度低至105 eV，极高的密度>100 cm−3，以及伴随着之字形事件的中等Alfvénicity的短时间间隔。当连接的变化从走廊到东侧的AR，在原地等离子体参数的慢太阳风表明一个明显不同的源区。这些观测结果提供了强有力的证据，表明形成S网一部分的狭窄开阔场走廊在其相关的太阳风流中产生了一些极端的特性。
From 2022 March 18 to 21, NOAA Active Region (AR) 12967 was tracked simultaneously by Solar Orbiter at 0.35 au and Hinode/EIS at Earth. During this period, strong blueshifted plasma upflows were observed along a thin, dark corridor of open magnetic field originating at the AR’s leading polarity and continuing toward the southern extension of the northern polar coronal hole. A potential field source surface model shows large lateral expansion of the open magnetic field along the corridor. Squashing factor Q-maps of the large-scale topology further confirm super-radial expansion in support of the S-web theory for the slow wind. The thin corridor of upflows is identified as the source region of a slow solar wind stream characterized by ∼300 km s−1 velocities, low proton temperatures of ∼5 eV, extremely high density >100 cm−3, and a short interval of moderate Alfvénicity accompanied by switchback events. When the connectivity changes from the corridor to the eastern side of the AR, the in situ plasma parameters of the slow solar wind indicate a distinctly different source region. These observations provide strong evidence that the narrow open-field corridors, forming part of the S-web, produce some extreme properties in their associated solar wind streams.