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arXiv 1107.0605astro-ph.SR
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NOAA AR 11045爆发失败的通量绳和相关M级耀斑的多波长观测

Multi-Wavelength Observations of a Flux Rope Failed in the Eruption and Associated M-Class Flare from NOAA AR 11045

Pankaj Kumar, A. K. Srivastava, B. Filippov, R. Erdelyi, Wahab Uddin

摘要:

利用TRACE、STEREO、SOHO/MDI、Hinode/XRT和BBSO的空间和地面观测资料,对2010年2月12日试图从NOAA AR 11045爆发的通量绳和相关的M级太阳耀斑进行了多波长观测。当磁绳从活动区上升时,在其一个支点附近触发了M1.1/2F级耀斑。我们认为,耀斑触发是由于重新连接的上升通量绳与周围的低洼磁回路。磁绳以约90 km/s的速度达到约0.15 Rs的投影高度,而软X射线通量在其上升过程中逐渐增强。磁通绳被上覆场抑制,充满的等离子体向其激活位点以西的负极性场移动。我们发现的第一个观测证据的初始抑制的通量绳由于可见的残留灯丝在色球和日冕的温度,在活动区的同一位置前几天的演变。SOHO/MDI磁象图显示在耀斑开始前约12小时出现了一个双极。出现的负极性向磁绳激活点移动,在光球极性反转线(PIL)附近触发耀斑。负极性区域朝向PIL的运动有助于在耀斑和磁绳激活部位积聚磁能。这项研究提供了一个独特的观测证据,上升的通量绳未能爆发,由于残留的灯丝和覆盖的磁场,以及相关的触发M级耀斑。

英文摘要:

We present the multi-wavelength observations of a flux rope that was trying to erupt from NOAA AR 11045 and the associated M-class solar flare on 12 February 2010 using space and ground based observations from TRACE, STEREO, SOHO/MDI, Hinode/XRT and BBSO. While the flux rope was rising from the active region, an M1.1/2F class flare was triggered nearby one of its footpoints. We suggest that the flare triggering was due to the reconnection of a rising flux rope with the surrounding low-lying magnetic loops. The flux rope reached a projected height of ~0.15 Rs with a speed of ~90 km/s while the soft X-ray flux enhanced gradually during its rise. The flux rope was suppressed by an overlying field and the filled plasma moved towards the negative polarity field to the west of its activation site. We find the first observational evidence of the initial suppression of a flux rope due to a remnant filament visible both at chromospheric and coronal temperatures that evolved couple of days before at the same location in the active region. SOHO/MDI magnetograms show the emergence of a bipole ~12 h prior to the flare initiation. The emerged negative polarity moved towards the flux rope activation site, and flare triggering near the photospheric polarity inversion line (PIL) took place. The motion of the negative polarity region towards PIL helped in the build-up of magnetic energy at the flare and flux rope activation site. This study provides a unique observational evidence of a rising flux rope that failed to erupt due to a remnant filament and overlying magnetic field, as well as associated triggering of an M-class flare.

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