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太阳暗条激活与爆发的观测研究
姜云春
Subtype博士
Thesis Advisor汪景琇
2001
Degree Grantor中国科学院云南天文台
Place of Conferral昆明
Degree Discipline天体物理
Keyword太阳日珥 暗条 耀斑 磁场 X射线日冕
Abstract太阳暗条激活与爆发的研究,不仅对理解暗条的形成、支撑和稳定性是重要的,对理解剧烈的太阳爆发,如耀斑和日冕物质抛射,也是重要的。本文对最近几年来暗条结构、动力学和磁场位形在观测和理论上的研究进展进行了回顾;同时,对暗条不稳定性的观测特征、扰动因素、可能的驱动机制和理论模型进行了综述。我们详细研究了几个扰动暗条的位形和动力学演化、相关的光球磁场和日冕结构的变化;以及相联系的耀斑发展。主要结果归纳如下:1.一旦暗条受到扰动,则螺旋结构和运动的出现是一个正常结果,而且暗条螺旋并不必大到足以导致爆发。这表明螺旋磁场在扰动暗条中的存在可能是普遍的。在一个宁静暗条的激活过程中,我们首次发现了独特的“速度绳”图案,这清晰表明了扰动暗条中螺旋场的出现。2.在一个活动区暗条扰动事件的研究中,我们发现,暗条能多次激活,且每次扰动都伴随有一个耀斑,但暗条并不爆发或消失。我们首次发现,整个暗条的激活可山几个暗条缠绕纤维中的一条受到扰动而产生,而其它纤维可保持不动。3.在一个左旋爆发暗条中,我们首次认证了其螺旋结构是左旋的。这与Martin&McAllister(1997)的预言相符,而与Rust&Kumar(1994)的假设相矛盾;我们进一步推断,宁静态暗条的磁场并不是螺旋的,而扰动期间的螺旋结构是山非螺旋结构之间的磁重联所产生的。4.暗条扰动与暗条通道中的光球运动和光球磁场变化有密切联系。气孔的诞生和运动、黑子的挤压和剪协以及磁流的浮现和对消都可对暗条的失稳有贡献。5.我们把暗条失稳的原因解释为光球层中稳定的对消重联。通过在暗条中感应电流及改变暗条和光球之间的磁拴接,这种爆发前重联可导致磁通量和磁复杂性在暗条中的积累,从而直接与暗条不稳定性相关。在研究一个山浮现偶极明显驱动的活动区暗条爆发时,我们发现这一爆发是由于偶极和暗条上X射线环之间的相互作用所导致的;我们给出清晰的证据表明,在偶极浮现过程中,它们的交界面上发生了缓慢的光球重联。
Other AbstractThe study of solar filament activations and eruptions is important not only in understanding formation, supporting and stability of filaments in general, but also in understanding violent solar eruptions such as flares and coronal mass ejections. In the present paper, the observational and theoretical progresses in the more recent study of structure, dynamics and magnetic field configuration of filament are introduced; the observational characteristics, disturbing agents, possible driving mechanisms and theoretical models of filament instability are also summarized. It is studied for the detailed morphological and dynamic evolution of several disturbed filaments, the relevant changes of photospheric magnetic field and coronal structure, as well as the development of associated flares. The main results are included as follows: 1.Once filaments are disturbed, the presence of twisted structure and motion is not an uncommon result, and the filament twist need not to be great enough to lead to an eruption. The fact suggests that twisted magnetic field may commonly exist in disturbed filament. For the first time, we found a unique "velocity rope" pattern during the activating process of a quiescent filament, which clearly revealed the twisted field in the disturbed filament. 2.In study of the filament disturbances in an active region, we showed that the filament underwent successive activation and each disturbance was followed by a flare, but it did not erupt or disappear. For the first time, we fount that the activation of the whole filament could be resulted from the disturbance of one of twisted filament threads, while the other threads remain nearly stationary. 3.For the first time, we identify that the helical structure appeared in an eruptive sinistral filament was left-helical one. Such identification is consistent with Martin & McAllister's predication (1997) but at odds with Rust & Kumar's (1994) assumption; we further refer that magnetic field of filaments is not helical in their quiescent status and helical structure during filament disturbance is formed by magnetic reconnection between non-helical structures. 4.The filament disturbances are closely associated with photospheric displacement and changes of photospheric magnetic field in filament channel. The pore birth and movement, the sunspots squeeze and shear, the magnetic flux emergence and cancellation may be all contributed to loss of filament stability. 5.The cause of filament destabilization is interpreted as steady cancellation reconnection in the photosphere layer. Such pre-emptive reconnection lead to the accumulation of magnetic flux and complexity in filament via inducing current and changing the magnetic tether of filament to the photosphere, so directly relevant to filament disturbances. In the study of the eruption of an active-region filament, which was obviously driven by an emerging bipole, we found that the eruption was due to the interaction between the bipole and the X-ray loops overlying the filament, and we provided clear evidence that slowly photospheric reconnection in their interface occurred during the bipole emergence.
Subject Area天文学
Pages110
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6583
Collection太阳物理研究组
Recommended Citation
GB/T 7714
姜云春. 太阳暗条激活与爆发的观测研究[D]. 昆明. 中国科学院云南天文台,2001.
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