Prediction of atmospheric turbulence refractive index structure constant based on deep learning

2020 ◽  
Author(s):  
Ma Shengjie ◽  
Hao Shiqi ◽  
Zhao Qingsong ◽  
Xu chenlu ◽  
Xiao Junling
Keyword(s):  
Refractive Index ◽  
Deep Learning ◽  
Atmospheric Turbulence ◽  
Structure Constant ◽  
Index Structure

scholarly journals Energy Spectra of Atmospheric Turbulence for Calculating Cn2 Parameter. I. Maidanak and Suffa Observatories in Uzbekistan

Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1614
Author(s):  
Artem Yu. Shikhovtsev ◽  
Pavel G. Kovadlo ◽  
Evgeniy A. Kopylov ◽  
Mansur A. Ibrahimov ◽  
Shuhrat A. Ehgamberdiev ◽  
...  
Keyword(s):  
Refractive Index ◽  
Atmospheric Turbulence ◽  
Baroclinic Instability ◽  
Structure Constant ◽  
Index Structure ◽  
Energy Spectra ◽  
Atmospheric Conditions ◽  
Astronomical Observations ◽  
Turbulence Spectra ◽  
Wide Range

Knowledge of the turbulence spectra is of interest for describing atmospheric conditions as applied to astronomical observations. This article discusses the deformations of the turbulence spectra with heights in a wide range of scales at the sites of the Maidanak and Suffa observatories. It is shown that the energy of baroclinic instability is high at the sites of these observatories and should be taken into account in the calculations of the refractive index structure constant Cn2.

scholarly journals Method for Measuring the Second-Order Moment of Atmospheric Turbulence

Atmosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 564
Author(s):  
Hong Shen ◽  
Longkun Yu ◽  
Xu Jing ◽  
Fengfu Tan
Keyword(s):  
Atmospheric Turbulence ◽  
Weighting Function ◽  
Structure Constant ◽  
Turbulence Models ◽  
Second Order ◽  
Index Structure ◽  
Order Moment ◽  
Site Testing ◽  
Optical Effects ◽  
Novel Method

The turbulence moment of order m (μm) is defined as the refractive index structure constant Cn2 integrated over the whole path z with path-weighting function zm. Optical effects of atmospheric turbulence are directly related to turbulence moments. To evaluate the optical effects of atmospheric turbulence, it is necessary to measure the turbulence moment. It is well known that zero-order moments of turbulence (μ0) and five-thirds-order moments of turbulence (μ5/3), which correspond to the seeing and the isoplanatic angles, respectively, have been monitored as routine parameters in astronomical site testing. However, the direct measurement of second-order moments of turbulence (μ2) of the whole layer atmosphere has not been reported. Using a star as the light source, it has been found that μ2 can be measured through the covariance of the irradiance in two receiver apertures with suitable aperture size and aperture separation. Numerical results show that the theoretical error of this novel method is negligible in all the typical turbulence models. This method enabled us to monitor μ2 as a routine parameter in astronomical site testing, which is helpful to understand the characteristics of atmospheric turbulence better combined with μ0 and μ5/3.

Estimating refractive index structure constant and extinction coefficient under misalignment

Optik ◽  
2020 ◽  
Vol 206 ◽  
pp. 164182
Author(s):  
Dagang Jiang ◽  
Ting Lyu ◽  
Xin Liu ◽  
Yishuai Yuan ◽  
Bin Zhu
Keyword(s):  
Refractive Index ◽  
Extinction Coefficient ◽  
Structure Constant ◽  
Index Structure

scholarly journals Equivalent refractive-index structure constant of non-Kolmogorov turbulence

2015 ◽  
Vol 23 (18) ◽  
pp. 23004 ◽  
Author(s):  
Yujie Li ◽  
Wenyue Zhu ◽  
Xiaoqing Wu ◽  
Ruizhong Rao
Keyword(s):  
Refractive Index ◽  
Structure Constant ◽  
Index Structure ◽  
Kolmogorov Turbulence
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