来自Hinode/XRT观测的日冕XBPs的强度振荡
Intensity oscillations in coronal XBPs from Hinode/XRT observations
摘要：
我们的目的是研究日冕X射线亮点（XBPs）的强度振荡。我们分析了2007年4月14日获得的软X射线图像的7小时长的时间序列，使用Hinode任务上的X射线望远镜（XRT）以2分钟的节奏。我们使用IDL中的SSW导出14个XBP和2个背景区域的时间序列。我们首次尝试对XBPs数据进行功率谱分析，以确定强度振荡的周期。日冕X射线亮点（XBPs）XBPs的功率谱在不同的频率处显示出几个显著的峰，对应于从几分钟到几小时的各种时间尺度。所有XBP的光变曲线给人的印象是，XBP可以根据发射水平分为三类：（i）弱XBP;（ii）亮XBP;和（iii）非常强的XBP。强度振荡的周期是一致的，在所有的XBP和独立的亮度水平，这表明在所有三组XBP的加热机制是相似的。不同类别的XBP可能与它们所关联的磁场的不同强度有关。
英文摘要：
Our aim is to investigate the intensity oscillations in coronal X-ray Bright Points (XBPs). We analysed a 7-hours long time sequence of the soft X-ray images obtained on April 14, 2007 with 2-min cadence using X-Ray Telescope (XRT) on-board the Hinode mission. We use SSW in IDL to derive the time series of 14 XBPs and 2 background regions. For the first time, we have tried to use power spectrum analysis on XBPs data to determine the periods of intensity oscillations. coronal X-ray Bright Points (XBPs). The power spectra of XBPs show several significant peaks at different frequencies corresponding to a wide variety of time scales which range from a few minutes to hours. The light curves of all the XBPs give the impression that the XBPs can be grouped into three classes depending on emission levels: (i) weak XBPs; (ii) bright XBPs; and (iii) very strong XBPs. The periods of intensity oscillation are consistent in all the XBPs and are independent of their brightness level, suggesting that the heating mechanisms in all the three groups of XBPs are similar. The different classes of XBPs may be related to the different strengths of the magnetic field with which they have been associated.
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