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| Profile and Character of Atmospheric Structure Constant of Refractive Index Cn2 |
| SUN Gang,WENG Ning-Quan,XIAO Li-Ming,WU Yi |
| Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031;Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031;Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031;Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031 |
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Abstract Random fluctuations of turbulence bring random fluctuations of the refractive index, making the atmosphere a random fluctuation medium that destroys the coherence of light-waves. Research in atmospheric turbulence is actually the investigation of the atmospheric refractive index. The atmospheric structure constant of refractive index, Cn2, is an important parameter denoting atmospheric turbulence. In this paper, Cn2 is measured during the day and at night and in all four seasons using a high sensitivity micro-thermal meter QHTP-2. The vertical profile of Cn2 in Hefei (0–30 km) is investigated by the analysis of experimental data. The average profile of Cn2 in Hefei exhibits conspicuous day and night differences with increased altitude. The distribution of log(Cn2) is nearly normal and has conspicuous seasonal differences.
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Received: 15 December 2011
Revised: 26 March 2012
Accepted: 13 April 2012
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