arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.07367astro-ph.SRastro-ph.IM
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日冕成像仪主镜表面散射杂散光的模拟

Simulations of stray light from the surface scattering of the Solar Corona Imager primary mirror

Jianchao Xue, Marco Romoli, Federico Landini, Cristian Baccani, Hui Li, Yunqi Wang, Bo Chen

摘要:

太阳日冕成像仪是ASO-S飞行任务上的一个内掩日冕成像仪,它具有在H I {Lyman- \textalpha }(Ly-alpha)和白光(WL)波段成像内日冕的优点。然而,由主镜(M1)引起的太阳圆盘光的散射成为杂散光的主要来源。为了研究杂散光抑制的方法,在Zemax OpticStudio中采用三种散射模型对M1散射进行建模。在两个通道中,日冕发射与预测杂散光的比率沿视场减小。Ly-alpha通道的杂散光一般低于冠状发射,但WL通道的杂散光在2.5 Rsun时往往比冠状信号高一个数量级。得到了最佳的参数组合,使杂散光抑制到所需的水平,这对M1的制造提出了一些限制。此外,建议采用K相关模型来模拟表面散射。

英文摘要:

The Solar Corona Imager is an internally occulted coronagraph on board the ASO-S mission, which has the advantage of imaging the inner corona in H I {Lyman-\textalpha} (Ly-alpha) and white-light (WL) wavebands. However, scattering of solar disk light by the primary mirror (M1) becomes the main source of stray light. To study the methods of stray light suppression, three scattering models are used to model M1 scattering in Zemax OpticStudio. The ratio of coronal emission to predicted stray light decrease along field of view in both channels. The stray light in Ly-alpha channel is generally lower than coronal emission, but the stray light in WL channel tends to be one order of magnitude higher than coronal signal at 2.5 Rsun. Optimized parameter combinations that suppress the stray light to required level are obtained, which put some limitations on the M1 manufacture. Besides, K-correlation model is recommended to simulate surface scattering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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