Emergence of a Helical Flux Rope under an Active Region Prominence
Emergence of a Helical Flux Rope under an Active Region Prominence
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DOI：
10.1086/528792
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发表时间：
2008-01
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.
中科院分区：
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.
2007年4月28日至5月9日，利用日野卫星上的太阳光学望远镜（SOT）对NOAA ar10953进行了连续观测。一个日珥位于太阳主黑子东南方的极逆温线上。这些观测为我们提供了日珥下光球上矢量磁场的时间序列。结果表明：(1)沿PIL两侧相邻的相反极性区域先是横向扩大，然后逐渐缩小；(2)这些相邻区域具有垂直弱、水平强的磁场。(3)随着时间的推移，光球上沿PIL方向的水平磁场方向由正极性逐渐变化为反极性。(4)水平磁场区蓝移。这表明螺旋通量绳从光球下沿日珥下的PIL进入日冕。我们认为，这种向日冕提供的螺旋磁通与活动区域日珥的演化和维持有关。
Continuous observations were obtained of NOAA AR 10953 with the Solar Optical Telescope (SOT) on board the Hinode satellite from 2007 April 28 to May 9. A prominence was located over the polarity inversion line (PIL) to the southeast of the main sunspot. These observations provided us with a time series of vector magnetic fields on the photosphere under the prominence. We found four features: (1) The abutting opposite-polarity regions on the two sides along the PIL first grew laterally in size and then narrowed. (2) These abutting regions contained vertically weak but horizontally strong magnetic fields. (3) The orientations of the horizontal magnetic fields along the PIL on the photosphere gradually changed with time from a normal-polarity configuration to an inverse-polarity one. (4) The horizontal magnetic field region was blueshifted. These indicate that helical flux rope was emerging from below the photosphere into the corona along the PIL under the preexisting prominence. We suggest that this supply of a helical magnetic flux to the corona is associated with evolution and maintenance of active region prominences.