论文标题
3分钟波前的动力学及其与黑子磁场的关系
The dynamics of 3-minute wavefronts and their relation to sunspot magnetic fields
论文作者
论文摘要
我们介绍了一项研究，该研究于2010年12月10日在太阳能活动区域NOAA 11131中发生，这是由1600a，304a和171a通道的太阳能动力学观测员捕获的。对于光谱分析，我们采用了基于经验模式分解的开发数字技术，采用了像素化的小波过滤。我们研究了3分钟的波动力学，以获得与下面黑子的磁性结构的关系。我们发现，在波训练的开发过程中，运动路径沿优先方向发生，并且可以将宽带波前表示为一组单独的窄带振荡源。当波经过不同的磁场倾斜角引起的王朝不均匀性时，这些来源变得可见。我们发现波前的空间和频率碎片，并推断出波前窄带球形和线性部分的组合提供了观察到的螺旋性。磁场倾斜角的地图证实了这一假设。我们检测到翁布拉尔结构的激活，因为沿着前脊的来源中振荡的增加。它们的时间动力与蒙布拉尔闪光的发生有关。源的空间定位随着时间的流逝而稳定，取决于振荡周期。我们建议这些来源是沿着环形从umbra的磁束向外延伸的波路径的结果。
We present a study of wave processes occurring in solar active region NOAA 11131 on 2010 December 10, captured by the Solar Dynamics Observatory in the 1600A, 304A, and 171A channels. For spectral analysis we employed pixelised wavelet filtering together with a developed digital technique based on empirical mode decomposition. We studied the 3-minute wave dynamics to obtain relationships with the magnetic structuring of the underlying sunspot. We found that during development of wave trains the motion path occurred along a preferential direction, and that the broadband wavefronts can be represented as a set of separate narrowband oscillation sources. These sources become visible as the waves pass through the umbral inhomogeneities caused by the differing magnetic field inclination angles. We found the spatial and frequency fragmentation of wavefronts, and deduced that the combination of narrowband spherical and linear parts of the wavefronts provide the observed spirality. Maps of the magnetic field inclination angles confirm this assumption. We detect the activation of umbral structures as the increasing of oscillations in the sources along the front ridge. Their temporal dynamics are associated with the occurrence of umbral flashes. Spatial localisation of the sources is stable over time and depends on the oscillation period. We propose that these sources are the result of wave paths along the loops extending outwards from the magnetic bundles of the umbra.
