Stray-Light Suppression of the Internally Occulted Reflecting Solar Corona Imager-猫眼课题宝

DOI：

10.3389/fphy.2022.890197

发表时间：

2022-06

期刊：

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Guang Zhang;Yunqian Wang;Ling-Ping He;Xiaodong Wang;Shuai Ren;Yubo Xuan;Fei Liu;Bo Chen

为了实现对超低亮度日冕的清晰观测，为预报严重影响人类生存环境的空间天气提供物理依据，杂散光抑制水平成为影响日冕观测发展的关键因素。在本研究中，太阳日冕成像仪（SCI）是一台同时独立观测HI Lyman-alpha内日冕的双波段内掩反射日冕仪，采用杂散光抑制方法（121.6 ± 10 nm）线和白光（700.0 ± 40 nm）波段，视场（FOV）从1.1到2.5 R（R代表平均太阳半径）。分析了主镜的面形误差、外观缺陷和颗粒污染等散射杂散光，并在实验室测试的基础上建立了相应的散射模型进行仿真。实验室中SCI的杂散光测量结果表明，在白光（WL）波段，在2.5 R（B为太阳盘的平均亮度）处，杂散光水平可以被抑制到10−8 B量级，这与通过模拟获得的杂散光水平一致，验证了建模和模拟。

In order to achieve a clear observation of the ultra-low brightness solar corona and provide a physical basis for forecasting space weather that seriously affects the human living environment, the stray-light suppression level becomes the key factor affecting the development of the coronagraph. In this study, a stray-light suppression method is adopted for Solar Corona Imager (SCI) which is a dual-waveband internally occulted reflecting coronagraph simultaneously and independently observing the inner corona in the HI Lyman-alpha (121.6 ± 10 nm) line and white-light (700.0 ± 40 nm) wavebands with a field-of-view (FOV) from 1.1 to 2.5 R⊙ (R⊙ stands for the mean solar radius). The scattered stray-light from the primary mirror, including the surface errors, cosmetic defects, and particulate contamination, is analyzed and suppressed, and the corresponding scattering models are established for simulation based on the laboratory testing. The stray-light measurement results for SCI in the laboratory show that the stray-light level can be suppressed to the order of 10−8 B⊙ at 2.5 R⊙ (B⊙ is the mean brightness of the solar disk) in the white-light (WL) band, which is consistent with the stray-light level obtained by simulation and verifies the modeling and simulation.

Stray-Light Suppression of the Internally Occulted Reflecting Solar Corona Imager

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