High-frequency waves (5 mHz to 20mHz) have previously been suggested as a source of energy accounting partial heating of the quiet solar atmosphere. The dynamics of previously detected high-frequency waves is analysed here. Image sequences are taken using the German Vacuum Tower Telescope (VTT), Observatorio del Teide, Izana, Tenerife, with a Fabry-Perot spectrometer. The data were speckle reduced and analyzed with wavelets. Wavelet phase-difference analysis is performed to determine whether the waves propagate. We observe the propagation of waves in the frequency range 10mHz to 13mHz. We also observe propagation of low-frequency waves in the ranges where they are thought to be evanescent in regions where magnetic structures are present.
On the fine structure of the quiet solar \Ca II K atmosphere
我们调查的形态学,动力学和演化特性的互联网络和网络精细结构的安静的太阳在磁盘中心。该分析是基于$\sim$ 6小时窄带滤光片时间序列,其中心是内翼\Ca II K $_{\rm 2v}$反转,波长为393.3 nm。互联网络的结果与来自安静太阳的数值模拟的预测有关。在我们的观测中,互联网络的平均进化时间尺度为52秒。网络间的晶粒显示出出现在平均单元尺寸为$\sim$ 4-5弧秒的网状图案上的趋势。根据这个大小和网格的空间组织,我们推测,这种模式是有关的对流模拟预测的光球下沉气流的存在。图像分割表明,网络和网络间的晶粒的典型尺寸在1.6弧的数量级。
Pulse phase variations of the X-ray spectral features in the radio-quiet neutron star 1E 1207-5209
本文介绍了位于壳状超新星遗迹G296.5+10.0中心的射电宁静X射线脉冲星1 E 1207-5209的XMM-牛顿观测结果。X射线谱的特征在于在能量约0.7 keV和约1.4 keV处存在两条与相位相关的吸收线。此外,这些宽光谱特征具有显著的子结构,表明它们是由于几条较窄的线的混合。我们将这些特征解释为含有金属的大气和几个10 ^12 G的磁场值的证据,与观测到的自旋下降速率P_dot=(1.98+/-0.83)*10^(-14)s/s一致。由于1 E 1207-5209是唯一一颗显示出这些特征的X射线发射脉冲星,我们尝试将它们与该天体独特的年龄和能量特征联系起来。我们认为,一个年轻的年龄和低水平的磁层活动是有利的条件,探测原子光谱特征的金属在中子星的大气中,这将被覆盖的薄层的吸积氢在较老的对象或掩盖的非热过程在年轻的高能中子星。