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arXiv 1402.4989astro-ph.SR
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极冕日珥/暗条系统的结构和演化

On the structure and evolution of a polar crown prominence/filament system

N. K. Panesar, D. E. Innes, D. J. Schmit, S. K. Tiwari

摘要:

极冠日冕是由部分环绕太阳两极的色球等离子体在60和70度纬度之间形成的。我们的目标是诊断的3D动力学极冠日珥使用高节奏EUV图像从太阳动力学天文台(SDO)/AIA在304和171 A和Ahead航天器的日地关系天文台(STEREO-A)/EUVI在195 A。使用特定结构的时间序列,我们比较了195 A年的日珥动力学与195 A年的日珥动力学。致密的日珥物质形成垂直的柱状物,它们之间相隔数十微米,并由等离子体的动态桥连接,在304/171 A双色图像中清晰可见。我们还观察到日珥中速度为15 km/s的间歇但重复的流动,这些流动似乎与太阳盘面上的EUV亮点有关。日珥和上覆空洞之间的边界看起来像一个尖锐的边缘。我们讨论了在日珥上方和周围看到的冕腔的结构。SDO/HMI和GONG磁图用于推断潜在的磁性拓扑结构。日珥相对于磁场的演化和结构似乎符合暗条链模型。

英文摘要:

Polar crown prominences are made of chromospheric plasma partially circling the Suns poles between 60 and 70 degree latitude. We aim to diagnose the 3D dynamics of a polar crown prominence using high cadence EUV images from the Solar Dynamics Observatory (SDO)/AIA at 304 and 171A and the Ahead spacecraft of the Solar Terrestrial Relations Observatory (STEREO-A)/EUVI at 195A. Using time series across specific structures we compare flows across the disk in 195A with the prominence dynamics seen on the limb. The densest prominence material forms vertical columns which are separated by many tens of Mm and connected by dynamic bridges of plasma that are clearly visible in 304/171A two-color images. We also observe intermittent but repetitious flows with velocity 15 km/s in the prominence that appear to be associated with EUV bright points on the solar disk. The boundary between the prominence and the overlying cavity appears as a sharp edge. We discuss the structure of the coronal cavity seen both above and around the prominence. SDO/HMI and GONG magnetograms are used to infer the underlying magnetic topology. The evolution and structure of the prominence with respect to the magnetic field seems to agree with the filament linkage model.

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