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arXiv 1608.01534astro-ph.SR
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日冕亮点中的双向运动结构

The Bi-directional Moving Structures in a Coronal Bright Point

Dong Li, Zongjun Ning, Yingna Su

摘要:

我们报道了2015年7月14日日冕亮点(CBP)中的双向运动结构。它由太阳动力学天文台(SDO)上的大气成像组件(AIA)观测。这种CBP的寿命约为10分钟,形状弯曲。观测结果表明,CBP亮核中有许多亮结构间歇性地向外移动。在AIA 171、193、211、131、94、335和304 A,缝式钳口(SJI)1330和1400 A处可以清楚地看到这种移动结构。为了分析这些移动结构,从AIA和SJI图像中沿着移动方向用弯曲缝隙切割CBP。然后我们可以得到时间-距离切片,包括强度和强度导数图,从这些切片中,运动结构被识别为斜条纹,并且它们具有双向性、对称性和周期性的特征。平均速率约为300 km/s,而典型周期约为90 s。所有这些特征(包括双向流动及其周期性)可以在所有9个波长处同时检测。这种CBP发生在一对小磁极之间的位置。高时间分辨率的观测表明,它们在其寿命期间相互靠近。这些事实支持了CBP的磁重联模型,双向运动结构可能是重联后的观测流出。因此,它们可以作为磁重联的直接观测证据。

英文摘要:

We report the bi-directional moving structures in a coronal bright point (CBP) on 2015 July 14. It is observed by the Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO). This CBP has a lifetime of about 10 minutes, and a curved shape. The observations show that many bright structures are moving intermittently outward from the CBP brightness core. Such moving structures are clearly seen at AIA 171, 193, 211, 131, 94, 335 and 304 A, slit-jaw (SJI) 1330 and 1400 A. In order to analyze these moving structures, the CBP is cut along the moving direction with a curved slit from the AIA and SJI images. Then we can obtain the time-distance slices, including the intensity and intensity-derivative diagrams, from which, the moving structures are recognized as the oblique streaks, and they are characterized by the bi-direction, simultaneity, symmetry, and periodicity. The average speed is around 300 km/s, while the typically period is about 90 s. All these features (including the bi-directional flows and their periodicity) can be detected simultaneously at all the 9 wavelengths. This CBP takes place at the site between a small pair of magnetic polarities. High time resolution observations show that they are moving close to each other during its lifetime. These facts support the magnetic reconnection model of the CBP and the bi-directional moving structures could be the observational outflows after the reconnection. Therefore, they can be as the direct observation evidence of the magnetic reconnection.

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