Hinode Observations of the Onset Stage of a Solar Filament Eruption
Hinode Observations of the Onset Stage of a Solar Filament Eruption
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DOI：
10.1093/pasj/59.sp3.s823
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发表时间：
2007-11
影响因子：
2.3
通讯作者：
A. Sterling;R. Moore;T. Berger;M. Bobra;John Davis;P. Jibben;R. Kano;L. Lundquist;D. Myers;N. Narukage;T. Sakao;K. Shibasaki;R. Shine;T. Tarbell;M. Weber
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文献类型：
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作者：
A. Sterling;R. Moore;T. Berger;M. Bobra;John Davis;P. Jibben;R. Kano;L. Lundquist;D. Myers;N. Narukage;T. Sakao;K. Shibasaki;R. Shine;T. Tarbell;M. Weber
我们使用日立X射线望远镜(XRT)和太阳光学望远镜(SOT)滤光片(FG)斯托克斯-V磁图观测，研究了太阳喷发的早期开始，其中包括我们在跟踪EUV图像中观察到的喷发灯丝。在快速喷发和强软X射线(SXR)耀斑之前，该细丝经历了至少20分钟的缓慢上升；这种缓慢上升之前已经有过报道，新的Hinode数据解释了在此期间发生的物理过程。XRT图像显示，在慢上升阶段，在灯丝跟踪的剪切核心场中，SXR在表观重联低处形成SXR S型；在缓慢上升阶段，EUV和SXR都有一个低能级强度峰。MDI和SOT FG Stokes-V磁图显示，先占细丝沿相反极性增强的网络单元之间的中性线移动，SOT磁图显示这些相反的磁场在喷发前至少流动并相互抵消了6个小时。从MDI数据中，我们测量到取消的网络字段大约是。40G，我们估计大约是。10(Exp 19)Mx的通量在喷发前的五个小时内被抵消；这只是火山爆发和耀斑所跨越的总通量的大约5%，但显然它的系绳切断抵消足以破坏持有该灯丝的Sigmoid场的稳定，并导致该场的爆发。
We used Hinode X-Ray Telescope (XRT) and Solar Optical Telescope (SOT) filtergraph (FG) Stokes-V magnetogram observations, to study the early onset of a solar eruption that includes an erupting filament that we observe in TRACE EUV images. The filament undergoes a slow rise for at least 20min prior to its fast eruption and strong soft X-ray (SXR) flaring; such slow rises have been previously reported, and the new Hinode data elucidate the physical processes occurring during this period. XRT images show that during the slow-rise phase, an SXR sigmoid forms from apparent reconnection low in the sheared core field traced by the filament, and there is a low-level intensity peak in both EUV and SXRs during the slow rise. MDI and SOT FG Stokes-V magnetograms show that the pre-emption filament is along a neutral line between opposing-polarity enhanced network cells, and the SOT magnetograms show that these opposing fields are flowing together and canceling for at least six hours prior to eruption. From the MDI data we measured the canceling network fields to be approx. 40 G, and we estimated that approx. 10(exp 19)Mx of flux canceled during the five hours prior to eruption; this is only approx.5% of the total flux spanned by the eruption and flare, but apparently its tether-cutting cancellation was enough to destabilize the sigmoid field holding the filament and resulted in that field's eruption.