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arXiv 1106.2702astro-ph.SR
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1997年5月12日探测NOAA AR 8038磁场变化在太阳耀斑和CME中的作用

Probing the Role of Magnetic-Field Variations in NOAA AR 8038 in Producing Solar Flare and CME on 12 May 1997

Rajmal Jain, Arun K. Awasthi, Babita Chandel, Lokesh Bharti, Y. Hanaoka, A. L. Kiplinger

摘要:

我们对1997年5月12日发生的一次CME和一次中等大小的1B/C1.3耀斑进行了多波长研究。本文介绍了1997年5月7- 16日在太阳上观测到的NOAA活动区8038的磁场变化。对Hα滤波图和MDI/SOHO磁图的分析揭示了该活动区连续但离散的浪涌活动,以及通量的出现和消除。这些磁象的电影揭示了两个重要的结果,即1997年5月10- 13日期间,先存区和新兴通量区(EFR)的主要相反极性相互接近,以及移动磁特征(MMF)以大约10小时的准周期从主要北极喷出。这些活动很可能是由光球辐合运动驱动的低层大气磁重联引起的,磁图上的这种现象很明显。磁场的变化,如通量,梯度和太阳黑子的旋转揭示了自由能正在缓慢地储存在日冕中。缓慢的低层磁重联可能是造成这种储存和形成S形核心领域或磁通绳导致最终爆发。极紫外线增亮的发生在S形核心领域之前的磁通绳的上升表明,喷发是由内部系绳切割重连,而不是外部突破重连触发。Hα带在前150秒的快速分离显示出脉冲式加速,这表明日冕物质抛射在内日冕中加速,这与重联电场的时间分布相一致。最后,我们提出了一个定性的模型,鉴于框架的太阳爆发,质量喷射,灯丝喷发,CME,和随后的耀斑。

英文摘要:

We carried out a multi-wavelength study of a CME and a medium-size 1B/C1.3 flare occurring on 12 May 1997. We present the investigation of magnetic-field variations in the NOAA Active Region 8038 which was observed on the Sun during 7--16 May 1997. Analyses of Hα filtergrams and MDI/SOHO magnetograms revealed continual but discrete surge activity, and emergence and cancellation of flux in this active region. The movie of these magnetograms revealed two important results that the major opposite polarities of pre-existing region as well as in the emerging flux region (EFR) were approaching towards each other and moving magnetic features (MMF) were ejecting out from the major north polarity at a quasi-periodicity of about ten hrs during 10--13 May 1997. These activities were probably caused by the magnetic reconnection in the lower atmosphere driven by photospheric convergence motions, which were evident in magnetograms. The magnetic field variations such as flux, gradient, and sunspot rotation revealed that free energy was slowly being stored in the corona. The slow low-layer magnetic reconnection may be responsible for this storage and the formation of a sigmoidal core field or a flux rope leading to the eventual eruption. The occurrence of EUV brightenings in the sigmoidal core field prior to the rise of a flux rope suggests that the eruption was triggered by the inner tether-cutting reconnection, but not the external breakout reconnection. An impulsive acceleration revealed from fast separation of the Hα ribbons of the first 150 seconds suggests the CME accelerated in the inner corona, which is consistent with the temporal profile of the reconnection electric field. In conclusion, we propose a qualitative model in view of framework of a solar eruption involving, mass ejections, filament eruption, CME, and subsequent flare.

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