超颗粒流激活的宁静太阳小型日冕物质抛射
Quiet Sun mini-CMEs activated by supergranular flows
摘要：
背景：平静太阳的大气层是由光球流控制的，光球流扫过混合极性磁场的聚集。沿超颗粒边界和结，有一个强的相关性之间的磁通量和明亮的色球和过渡区的排放。目的：研究光球流与极紫外图像中小耀斑增亮之间的关系。方法：我们描述了观测小喷发看到安静的太阳图像与极端紫外线成像仪（EUVI）的立体声。通过跟踪高分辨率MDI连续图像中的颗粒，研究了爆发建立阶段的光球流。结果：具有小日冕物质抛射（CME）特征的喷发发生在超颗粒细胞连接处。爆发产生在发病现场增亮，乌云或小灯丝喷射，和微弱的波移动与天空平面的速度高达150公里/秒。在所研究的两个例子中，它们似乎是被会聚和旋转的超颗粒流激活的，扭转了相反极性磁场的小浓度。据估计，整个太阳每天发生约1400次事件。这些事件中有三分之一似乎与波浪有关。通常情况下，电波持续约30分钟，传播距离为100角秒，因此在任何一个时间，它们覆盖了低日冕的1/30。
英文摘要：
Context: The atmosphere of the quiet Sun is controlled by photospheric flows sweeping up concentrations of mixed polarity magnetic field. Along supergranule boundaries and junctions, there is a strong correlation between magnetic flux and bright chromospheric and transition region emission. Aim: The aim is to investigate the relationship between photospheric flows and small flare-like brightenings seen in Extreme Ultraviolet images. Method: We describe observations of small eruptions seen in quiet Sun images taken with the Extreme UltraViolet Imager (EUVI) on STEREO. The photospheric flows during the eruption build-up phase are investigated by tracking granules in high resolution MDI continuum images. Results: Eruptions with characteristics of small coronal mass ejections (CMEs) occur at the junctions of supergranular cells. The eruptions produce brightening at the onset site, dark cloud or small filament ejections, and faint waves moving with plane-of-sky speeds up to 150 km/s. In the two examples studied, they appear to be activated by converging and rotating supergranular flows, twisting small concentrations of opposite polarity magnetic field. An estimate of the occurrence rate is about 1400 events per day over the whole Sun. One third of these events seem to be associated with waves. Typically, the waves last for about 30 min and travel a distance of 100 arcsec, so at any one time they cover 1/30th of the lower corona.
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