活动区谱斑的傅里叶分析
Fourier analysis of active-region plage
摘要：
本文研究了太阳色球层与过渡区的动力学相互作用。我们仔细比对了用过渡区和日冕探测器（TRACE）在1550、1600和1700 A附近的紫外通带和171和195 A的极紫外通带拍摄的图像序列。我们计算傅立叶相位差谱，分别在苔藓和非苔藓plage空间平均研究时间调制作为时间频率的函数。1550与171 A的比较显示在非苔藓斑中的零相位差。在苔状谱带中，所有UV和EUV通带之间的相位差随着频率的增加而呈现明显的上升趋势，在4-6 mHz之后突然变为零相位差。171和195 A序列之间的相位差在3 mHz以下呈现出浅的下降，然后在超过该值时也变为零相位差。我们属性之间的各种相似性的UV和EUV诊断，是明显的相位差图中的C IV共振线在1550和1600 A的通带的贡献。在较低频率处的强上升趋势表明存在向上传播的扰动。它指出了较低的色球层和上过渡区之间的对应关系，可能是慢模式磁声扰动，或者是色球层和日冕加热机制之间的联系。在较高频率下从这种上升趋势到零相位差的转变是由于以振荡方式隐藏热回路的足点的原纤维的间歇性遮蔽，所述足点在EUV和C IV线中是明亮的。
英文摘要：
We study the dynamical interaction of the solar chromosphere with the transition region in mossy and non-mossy active-region plage. We carefully align image sequences taken with the Transition Region And Coronal Explorer (TRACE) in the ultraviolet passbands around 1550, 1600, and 1700 A and the extreme ultraviolet passbands at 171 and 195 A. We compute Fourier phase-difference spectra that are spatially averaged separately over mossy and non-mossy plage to study temporal modulations as a function of temporal frequency. The 1550 versus 171 A comparison shows zero phase difference in non-mossy plage. In mossy plage, the phase differences between all UV and EUV passbands show pronounced upward trends with increasing frequency, which abruptly changes into zero phase difference beyond 4-6 mHz. The phase difference between the 171 and 195 A sequences exhibits a shallow dip below 3 mHz and then also turns to zero phase difference beyond this value. We attribute the various similarities between the UV and EUV diagnostics that are evident in the phase-difference diagrams to the contribution of the C IV resonance lines in the 1550 and 1600 A passbands. The strong upward trend at the lower frequencies indicates the presence of upward-traveling disturbances. It points to correspondence between the lower chromosphere and the upper transition region, perhaps by slow-mode magnetosonic disturbances, or by a connection between chromospheric and coronal heating mechanisms. The transition from this upward trend to zero phase difference at higher frequencies is due to the intermittent obscuration by fibrils that occult the foot points of hot loops, which are bright in the EUV and C IV lines, in oscillatory manner.
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