Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope
Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope
复制标题
新型真空太阳望远镜观测到的二维扫描光谱的合成方法
DOI：
10.1088/1674-4527/18/4/42
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发表时间：
2018-01
期刊：
影响因子：
--
通讯作者：
季凯帆
中科院分区：
文献类型：
--
作者：
蔡云芳;徐稚;季凯帆
In this paper we illustrate the technique used by the New Vacuum Solar Telescope (NVST) to increase the spatial resolution of two-dimensional (2D) solar spectroscopy observations involving two dimensions of space and one of wavelength. Without an image stabilizer at the NVST, large scale wobble motion is present during the spatial scanning, whose instantaneous amplitude can reach 1.3″ due to the Earth’s atmosphere and the precision of the telescope guiding system, and seriously decreases the spatial resolution of 2D spatial maps composed with scanned spectra. We make the following effort to resolve this problem: the imaging system (e.g., the TiO-band) is used to record and detect the displacement vectors of solar image motion during the raster scan, in both the slit and scanning directions. The spectral data (e.g., the Hα line) which are originally obtained in time sequence are corrected and re-arranged in space according to those displacement vectors. Raster scans are carried out in several active regions with different seeing conditions (two rasters are illustrated in this paper). Given a certain spatial sampling and temporal resolution, the spatial resolution of the composed 2D map could be close to that of the slit-jaw image. The resulting quality after correction is quantitatively evaluated with two methods. A physical quantity, such as the line-of-sight velocities in multiple layers of the solar atmosphere, is also inferred from the re-arranged spectrum, demonstrating the advantage of this technique.
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影响因子：
2.8
作者：
P. Mein
通讯作者：
P. Mein
影响因子：
6.5
作者：
Zhi Xu;A. Lagg;S. Solanki
通讯作者：
Zhi Xu;A. Lagg;S. Solanki
DOI：
10.1117/12.924834
发表时间：
2012-07
期刊：
--
影响因子：
--
作者：
K. Puschmann;H. Balthasar;C. Beck;R. Louis;E. Popow;T. Seelemann;R. Volkmer;M. Woche;C. Denker
通讯作者：
K. Puschmann;H. Balthasar;C. Beck;R. Louis;E. Popow;T. Seelemann;R. Volkmer;M. Woche;C. Denker
影响因子：
3.5
作者：
D. Menzel
通讯作者：
D. Menzel
影响因子：
0.9
作者：
Cao, W.;Gorceix, N.;Goode, P. R.
通讯作者：
Goode, P. R.