PROMINENCE FORMATION ASSOCIATED WITH AN EMERGING HELICAL FLUX ROPE
PROMINENCE FORMATION ASSOCIATED WITH AN EMERGING HELICAL FLUX ROPE
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DOI：
10.1088/0004-637x/697/1/913
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
T. Okamoto;S. Tsuneta;B. Lites;M. Kubo;T. Yokoyama;T. Berger;K. Ichimoto;Y. Katsukawa;S. Nagata-S.
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文献类型：
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作者：
T. Okamoto;S. Tsuneta;B. Lites;M. Kubo;T. Yokoyama;T. Berger;K. Ichimoto;Y. Katsukawa;S. Nagata-S.
太阳日珥的形成和演化过程以及磁性结构仍不清楚。为了研究日珥的形成过程，我们使用 Hinode 卫星上的太阳光学望远镜对 NOAA AR 10953 中的日珥进行了连续观测。正如我们在上一封信中报道的那样，我们发现了一个签名，表明螺旋磁通绳从光球层下方的预先存在的日珥下出现。在这里，我们研究了新兴螺旋磁通绳的更详细的特性和光球指示，并讨论了它们与日珥形成的关系。我们的主要结论是：（1）Ca ii H 线滤波器图中，没有强垂直磁场的暗区先变宽然后变窄。这种现象与作为光球对应物的螺旋磁通绳的出现是一致的。磁通绳的尺寸约为 30,000 公里长、10,000 公里宽。宽度大于突出部的宽度。 (2) 没有检测到剪切运动或会聚流，但我们发现了发散流，例如沿着极性反转线的中颗粒。中颗粒的存在可能与螺旋磁通绳的出现有关。 (3) 出现的螺旋磁通绳与先前存在的日珥的磁场重新连接，以在接下来的几天内稳定日珥。因此，我们推测日珥的日冕磁场以螺旋磁力绳的形式出现，有助于日珥的形成和维持。
The formation and evolution process and magnetic configuration of solar prominences remain unclear. In order to study the formation process of prominences, we examine continuous observations of a prominence in NOAA AR 10953 with the Solar Optical Telescope on the Hinode satellite. As reported in our previous Letter, we find a signature suggesting that a helical flux rope emerges from below the photosphere under a pre-existing prominence. Here we investigate more detailed properties and photospheric indications of the emerging helical flux rope, and discuss their relationship to the formation of the prominence. Our main conclusions are: (1) a dark region with absence of strong vertical magnetic fields broadens and then narrows in Ca ii H-line filtergrams. This phenomenon is consistent with the emergence of the helical flux rope as photospheric counterparts. The size of the flux rope is roughly 30,000 km long and 10,000 km wide. The width is larger than that of the prominence. (2) No shear motion or converging flows are detected, but we find diverging flows such as mesogranules along the polarity inversion line. The presence of mesogranules may be related to the emergence of the helical flux rope. (3) The emerging helical flux rope reconnects with magnetic fields of the pre-existing prominence to stabilize the prominence for the next several days. We thus conjecture that prominence coronal magnetic fields emerge in the form of helical flux ropes that contribute to the formation and maintenance of the prominence.