Space-based total reflection type far-ultraviolet and visible light double-band solar corona imaging system

Abstract

The invention provides a space-based total reflection type far-ultraviolet and visible light double-band solar corona imaging system comprising an entrance pupil, an off-axis parabolic reflecting mirror , an annular convex spherical mirror, an off-axis ellipsoidal reflecting mirror, a lyot diaphragm, a far ultraviolet / visible band plane beam splitter, a visible light plane reflecting mirror, a first detector and a second detector, and a light trap. According to the solar corona imaging system, a space-based observation mode is employed and full-reflection off-axis and long focal length optical structures are used to realize high-resolution, large-dynamic-range imaging of the solar corona in far-ultraviolet and visible-light dual-bands in the sun; the blank of the domestic space-based coronagraph field and the overseas field of the corona imaging instrument in the far-ultraviolet band is filled; the resolution and dynamic range of the coronagraph are improved; and the development of technologies related to the development of the coronagraph device is promoted.

Description

technical field [0001] The invention relates to the technical field of coronal imagers, in particular to a space-based total reflection far-ultraviolet and visible light dual-band coronal imaging system. Background technique [0002] The corona is the outermost layer of the sun's atmosphere, extending outward from the top of the solar transition region to several solar radii and beyond. Coronal activities have a great impact on the changes of the earth and its surrounding space environment, and are one of the key parts of space weather forecasting. Effective observation of the solar corona is of great significance to scientific research, human activities and even national security. [0003] At present, there are still the following problems in the coronagraph technology: the visible light band (530.3nm) coronagraph is mainly used for ground-based corona observation, and the image of the solar corona obtained by using a transmission structure for the first time. Compared wit...

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Problems solved by technology

Compared with the space-based observation method, the ground-based observation method has the disadvantages of atmospheric turbulence, scattering, and absorption interference, and cannot perform high-quality observations; the observation range of the coronagraph at home and abroad is above 1.3Rs, and the observation spectrum has many bands. It is Fe XIV line (530.3nm), Ce XV line (569.4nm), Fe X line (647.4nm), Hα line (656.3nm), Na I line (589.0nm) bands, and there is no far ultraviolet band and Lai A coronagraph that images the inner corona of the sun in the Mann-alpha band; at present, space-based coronagraphs in the world mostly use a retroreflective structure. 10″, with an ultraviolet resolution of 20″, the reflective part of the coronagraph of the catadioptric hybrid structure mainly realizes the shading of the solar surface and the collimation of the coronal light, and its imaging of the corona mainly depends on the refractor mirror group at the rear end , has the disadvantages of bulky size, insufficient resolution, and limited observation spectrum; the Solar Orbiter Metis coronagraph adopts the optical structure of an externally covered coaxial coronagraph, which has the disadvantages of large volume, serious vignetting, and low energy utilization ; There is no spectroscopic element in the SMESE coronagraph, and the collection of images in different bands can only be completed by rotating the filter wheel, and the positions of the off-axis ellipsoidal mirror 1 and the off-axis ellipsoidal mirror 2 are asymmetrical, making it difficult to install and adjust Large, off-axis ellipsoid mirrors are difficult to achieve a high roughness level in the process, so the system stray light is more serious. In addition, because SMESE adopts the polarization method of the reflective structure, there is no extra space in the system to install the beam splitter , there is a shortcoming of not being able to image multiple spectral segments at the same time

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