论文标题
一项对活性区域冠状环的短期衰减振荡的统计研究
A Statistical Study of Short-period Decayless Oscillations of Coronal Loops in an Active Region
论文作者
论文摘要
冠状环振荡是太阳能电晕的常见现象，通常被归类为衰减和衰减的振荡。使用太阳轨道上的极端紫外线成像仪（EUI）测量的高分辨率观察，我们统计调查了在活性区域中冠状环的短期（<200 s）的小规模横向振荡，即NOAA 12965，即111个冠状环。关于腐败的振荡。振荡周期从约11 s到185 s，中位周期为40 s。因此，它们也被称为短期振荡。相应的环长度从约10.5毫米至30.2 mm测量，并且建立了振荡时间对环长度的强烈依赖性，这表明短期振荡在本质上是站立的扭结模式。基于冠状地震学，扭结速度的测量约为330-1910 km/s，冠状环中的磁场强度估计约为4.1-25.2 g，而衰减的扭结振荡携带的能量范围则在于大约7 W M^（-2）至9220 W m^M^（-2）。我们的估计表明，短期衰减的无扭振荡携带的波能不能支持活性区域的冠状加热。
Coronal loop oscillations are common phenomena in the solar corona, which are often classified as decaying and decayless oscillations. Using the high-resolution observation measured by the Extreme Ultraviolet Imager (EUI) onboard the Solar Orbiter, we statistical investigate small-scale transverse oscillations with short periods (<200 s) of coronal loops in an active region, i.e., NOAA 12965. A total of 111 coronal loops are identified in EUI 174 A images, and they all reveal transverse oscillations without any significant decaying, regarding as decayless oscillations. Oscillatory periods are measured from about 11 s to 185 s, with a median period of 40 s. Thus, they are also termed as short-period oscillations. The corresponding loop lengths are measured from about 10.5 Mm to 30.2 Mm, and a strong dependence of oscillatory periods on loop lengths is established, indicating that the short-period oscillations are standing kink-mode waves in nature. Based on the coronal seismology, kink speeds are measured to about 330-1910 km/s, and magnetic field strengths in coronal loops are estimated to about 4.1-25.2 G, while the energy flux carried by decayless kink oscillations lies in the range from roughly 7 W m^(-2) to 9220 W m^(-2). Our estimations suggest that the wave energy carried by short-period decayless kink oscillations can not support the coronal heating in the active region.
