Shulou(Shulou.com)11/24 Report--

CTOnews.com, October 18, according to the official account "Science Island online", recently, the Anguang Institute of Hefei Institute of matter, Chinese Academy of Sciences, established a global atmospheric optical turbulence prediction model, and realized the global atmospheric optical turbulence intensity prediction and visualization characterization (measured by atmospheric coherence length) for the first time.

The prediction result of ▲ global atmospheric coherence length spatial distribution, which is the source of the official account "Science Island online". The model not only enriches and enhances the scientific understanding of the global change of atmospheric optical turbulence, but also provides support for advanced optoelectronic engineering, astronomical optical observation, satellite-to-ground laser communication and other applications.

According to reports, when light waves propagate in the earth's atmosphere, optical turbulence will cause light spot drift, light intensity flicker, beam jitter and other phenomena, further affecting the performance of advanced optoelectronic systems working in the atmosphere, and atmospheric optical turbulence has become the last bottleneck in the application of ground-based optoelectronic system engineering.

At present, although there are many technical means to detect atmospheric optical turbulence, limited by many factors, it is still very difficult to obtain the characteristics of optical turbulence intensity, probability distribution and spatio-temporal variation in a wide range of the world. For a long time, academia has been carrying out the construction of atmospheric optical turbulence prediction model in local typical environment, but no universal results have been obtained.

The prediction results of the cumulative distribution of atmospheric coherence length at ▲ famous observatories in the world revolve around the needs of advanced optoelectronic systems for the prediction of atmospheric optical turbulence characteristics in the future. Based on the historical detection data set and big data fusion analysis technology, and coupled with the fifth generation atmospheric reanalysis data set in Europe, the atmospheric optics research team of Anguang Institute has taken the lead in establishing a global atmospheric optical turbulence prediction model. The model breaks through the limitation that it is difficult to obtain atmospheric optical turbulence characteristics efficiently in wide area environment, and solves the key scientific and technical problems of wide area atmospheric optical turbulence prediction and visual characterization.

The prediction results of the model not only reveal the spatial distribution characteristics of global atmospheric optical turbulence parameters, but also point out that in addition to the traditional astronomical stations with good atmospheric optical turbulence conditions, such as the Qinghai-Tibet Plateau, the west coast of America and the Hawaiian Islands, there are also good atmospheric optical turbulence conditions in the Western Pacific and northeastern Africa. In particular, the "roof of Africa" Ethiopian plateau may also have an area with good atmospheric optical turbulence conditions. Moreover, combined with the global numerical weather forecast model, the model can also be used to predict the time variation characteristics of global atmospheric optical turbulence and provide scientific support for the medium-and long-term operation of large-scale ground-based advanced optoelectronic systems.

▲ "Roof of Africa" the prediction results of the cumulative distribution of atmospheric coherent length over the Ethiopian Plateau are published in the monthly Journal of the Royal Astronomical Society, the top international journal of geoscience and astronomy. Youth is the first author of this paper.

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