新真空太阳望远镜多波段高分辨率成像系统的视场定标

为了实现新真空太阳望远镜(NVST)多波段图像0.1″精度的视场匹配,提出了针孔光阑视场定标的方法,并在NVST光球[TiO(705.8nm)]通道和色球[Hα(656.28nm)]通道上进行了实验分析。采用11×11点阵的针孔阵列光阑,对两通道视场之间的旋转、放缩和平移关系进行了定标。通过仿射变换实现两通道太阳图像的高精度视场匹配,精度可达0.031″。虽然匹配残差在整个视场内(约为2′)存在不均匀性,视场边缘最大残差为0.076″。定标参数的数值会随着光学平台位置的变化而改变,造成了0.05″的视场匹配差异,但这些匹配差异都在分辨率要求的精度之内。对TiO通道和Hα通道实测数据的分析也证明了上述方法的精度估计。     

Three-dimensional image reconstruction of an Hα flare on 26 March 2001

Three-dimensional (3D) image reconstruction of an Hα flare near the solar disk center, is done by a series of line-center and off-line-center filtering observation, according to the physical meaning of contribution function based on the line formation theory. The contribution function represents the contribution from stellar atmospheric layers to the emergent specific intensity and describes the depth distribution of escape photons. In this paper, an Hα flare of 26 March 2001 is used to illustrate the 3D line-of-sight reconstruction and its development.