偶极浮现区与光球层磁螺度注入的观测研究
发布时间：2018-09-05 12:02
【摘要】：磁螺度是表征磁场扭曲与环绕程度的物理量，它在太阳大气中衰减的极为缓慢。对光球层磁螺度进行测量表明，太阳南半球有更多的正磁螺度注入而北半球有更多的负磁螺度的注入。考虑到磁螺度在太阳大气中几乎不衰减，这种半球注入的不平衡将会导致磁螺度在各自所在半球的大气内不断的积累。这些在太阳大气中积累的磁螺度很可能会触发诸如耀斑、暗条/日珥爆发、日冕物质抛射等太阳活动。同时，在包括太阳爆发事件在内的各种太阳活动中，几乎都找到了磁螺度存在的证据。这些都表明，研究磁螺度对于解释太阳活动具有重要意义。 尽管磁螺度在太阳活中研究存在着重要的意义，关于太阳上磁螺度的起源，我们却知之甚少。而最近的一项关于磁螺度不对称性的研究为解决活动区磁螺度起源带来了曙光。但是这项研究急需解决一些问题，于是本文对这个发现进行了更深入的研究。本文将DAVE算法应用到SDO/HMI12分钟视向磁图，分别对9个偶极新浮现区的两极计算了磁螺度注入。计算结果验证了偶极浮现区磁螺度注入存对极性的偏好。但与之前研究中大部分活动区表现为先导极性注入更多的磁螺度这一结果不同，本文中6个活动区表现为后随极性有更多的磁螺度注入。于是本文提出，，也许不能简单的认为偶极活动区的先导极性在磁螺度注入中更占优势。本文根据活动区磁通量之和的演化，将活动区的浮现过程分成了两个阶段，并发现磁螺度通量在两阶段有明显不同的表现。
[Abstract]:Magnetic helicity is a physical quantity representing the degree of distortion and circumference of magnetic field, which attenuates very slowly in the solar atmosphere. The measurements of the magnetic helicity of the photosphere show that there are more positive magnetic helicity injection in the southern hemisphere and more negative magnetic helicity injection in the northern hemisphere. Considering that the magnetic helicity is almost unattenuated in the solar atmosphere, this hemispherical injection imbalance will lead to the continuous accumulation of the magnetic helicity in the atmosphere of the respective hemispheres. The magnetic helicity accumulated in the solar atmosphere is likely to trigger solar activity such as flares, strip / prominence bursts, and coronal mass ejections. At the same time, almost all kinds of solar activities, including solar eruptions, have found evidence of magnetic helicity. All these indicate that the study of magnetic helicity is of great significance for the interpretation of solar activity. Although the study of magnetic snails is of great significance in solar life, little is known about the origin of magnetic snails on the sun. A recent study on the asymmetry of magnetic helicity provides the dawn for solving the origin of magnetic helicity in active regions. However, this study urgently needs to solve some problems, so this paper makes a more in-depth study of this discovery. In this paper, the DAVE algorithm is applied to the SDO/HMI12 minute apparent magnetic map, and the magnetic helicity injection is calculated for the two poles of nine new emerging dipoles. The calculated results verify the preference of magnetic helicity injection for polarity in the dipole emerging region. However, most of the active regions in this paper are different from the results of leading polarity injection with more magnetic helicity. In this paper, the six active regions show that there are more magnetic helicity injection with the polarity. It is suggested in this paper that the leading polarity of the dipole active region may not be considered to be more dominant in the magnetic helicity injection. In this paper, according to the evolution of the sum of magnetic flux in the active region, the emerging process of the active region is divided into two stages, and it is found that the flux of magnetic snail is obviously different in the two stages.
【学位授予单位】：中国科学院研究生院（云南天文台）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P182.9
本文编号：2224205
[Abstract]:Magnetic helicity is a physical quantity representing the degree of distortion and circumference of magnetic field, which attenuates very slowly in the solar atmosphere. The measurements of the magnetic helicity of the photosphere show that there are more positive magnetic helicity injection in the southern hemisphere and more negative magnetic helicity injection in the northern hemisphere. Considering that the magnetic helicity is almost unattenuated in the solar atmosphere, this hemispherical injection imbalance will lead to the continuous accumulation of the magnetic helicity in the atmosphere of the respective hemispheres. The magnetic helicity accumulated in the solar atmosphere is likely to trigger solar activity such as flares, strip / prominence bursts, and coronal mass ejections. At the same time, almost all kinds of solar activities, including solar eruptions, have found evidence of magnetic helicity. All these indicate that the study of magnetic helicity is of great significance for the interpretation of solar activity. Although the study of magnetic snails is of great significance in solar life, little is known about the origin of magnetic snails on the sun. A recent study on the asymmetry of magnetic helicity provides the dawn for solving the origin of magnetic helicity in active regions. However, this study urgently needs to solve some problems, so this paper makes a more in-depth study of this discovery. In this paper, the DAVE algorithm is applied to the SDO/HMI12 minute apparent magnetic map, and the magnetic helicity injection is calculated for the two poles of nine new emerging dipoles. The calculated results verify the preference of magnetic helicity injection for polarity in the dipole emerging region. However, most of the active regions in this paper are different from the results of leading polarity injection with more magnetic helicity. In this paper, the six active regions show that there are more magnetic helicity injection with the polarity. It is suggested in this paper that the leading polarity of the dipole active region may not be considered to be more dominant in the magnetic helicity injection. In this paper, according to the evolution of the sum of magnetic flux in the active region, the emerging process of the active region is divided into two stages, and it is found that the flux of magnetic snail is obviously different in the two stages.
【学位授予单位】：中国科学院研究生院（云南天文台）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P182.9
【参考文献】
相关期刊论文 前2条
1 汪景t;季海生;;空间天气驱动源——太阳风暴研究[J];中国科学:地球科学;2013年06期
2 Jun-Chao Hong;Yun-Chun Jiang;Jia-Yan Yang;Rui-Sheng Zheng;Yi Bi;Hai-Dong Li;Bo Yang;Dan Yang;;Twist in a polar blowout jet[J];Research in Astronomy and Astrophysics;2013年03期
本文编号：2224205
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