Plasma Upflows Induced by Magnetic Reconnection Above an Eruptive Flux Rope
Plasma Upflows Induced by Magnetic Reconnection Above an Eruptive Flux Rope
复制标题
喷发通量绳上方磁重联引起的等离子体上流
DOI：
10.1007/s11207-021-01849-7
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发表时间：
2021
期刊：
影响因子：
2.8
通讯作者：
Baker D
中科院分区：
文献类型：
--
作者：
Baker D
日出的极紫外成像光谱仪（EIS）的主要发现之一是在活动区边缘存在上升流。由于活动区域与日冕的大规模磁场有磁性联系，这些上升流可能是日冕中全球质量循环的贡献者。在这里，我们研究了在AR 10977（爆发耀斑SOL 2007 -12- 07 T04：50）的通量绳爆发期间观察到的速度超过70 km s−1的非常强烈的上升流的驱动机制，称为蓝翼不对称。我们使用Hinode/EIS光谱观测结合磁场建模来研究活动区的磁拓扑结构和强上升流之间的可能联系。位场源表面（PFSS）外推的大规模的领域显示了一个四极配置的分离器躺在上面的通量绳。磁场线诱导重联沿沿着分离器之前和期间的磁通绳喷发空间上连接到最强的蓝翼不对称的上流地区。流动是由活动区的密集和热拱圈与其上的延伸和纤细环重新连接时产生的压力梯度驱动的。鉴于分离器重连是更一般的准分界线（QSL）重连的一种特殊形式，我们得出结论，驱动最强上升流的机制实际上是，这与在所有活动区观测到的持续上升流10 - 20 km s-1的驱动力相同。
One of the major discoveries ofHinode’s Extreme-ultraviolet Imaging Spectrometer(EIS) is the presence of upflows at the edges of active regions. As active regions are magnetically connected to the large-scale field of the corona, these upflows are a likely contributor to the global mass cycle in the corona. Here we examine the driving mechanism(s) of the very strong upflows with velocities in excess of 70 km s−1, known as blue-wing asymmetries, observed during the eruption of a flux rope in AR 10977 (eruptive flare SOL2007-12-07T04:50). We useHinode/EIS spectroscopic observations combined with magnetic-field modeling to investigate the possible link between the magnetic topology of the active region and the strong upflows. A Potential Field Source Surface (PFSS) extrapolation of the large-scale field shows a quadrupolar configuration with a separator lying above the flux rope. Field lines formed by induced reconnection along the separator before and during the flux-rope eruption are spatially linked to the strongest blue-wing asymmetries in the upflow regions. The flows are driven by the pressure gradient created when the dense and hot arcade loops of the active region reconnect with the extended and tenuous loops overlying it. In view of the fact that separator reconnection is a specific form of the more general quasi-separatrix (QSL) reconnection, we conclude that the mechanism driving the strongest upflows is, in fact, the same as the one driving the persistent upflows of ≈10 – 20 km s−1observed in all active regions.
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DOI：
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发表时间：
1995
期刊：
影响因子：
--
作者：
L. Bagalá;C. H. Mandrini;M. Rovira;P. Démoulin;J. Hénoux
通讯作者：
J. Hénoux
帕克太阳探测器在遭遇2期间观测到的III型射电暴的活动区源
影响因子：
6.5
作者：
L. Harra;D. Brooks;S. Bale;C. Mandrini;Krzysztof Barczynski;R. Sharma;S. Badman;S. Vargas Domínguez;M. Pulupa
通讯作者：
M. Pulupa
影响因子：
4.9
作者：
Bradshaw, S. J.;Aulanier, G.;Del Zanna, G.
通讯作者：
Del Zanna, G.
影响因子：
2.8
作者：
Kamio, S.;Hara, H.;Hansteen, V. H.
通讯作者：
Hansteen, V. H.