scholarly journals Statistics of the Optical Turbulence from the Micrometeorological Measurements at the Baykal Astrophysical Observatory Site

Atmosphere ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 661 ◽  
Author(s):  
Artem Shikhovtsev ◽  
Pavel Kovadlo ◽  
Vladimir Lukin ◽  
Victor Nosov ◽  
Alexander Kiselev ◽  
...  
Keyword(s):  
Refractive Index ◽  
Atmospheric Turbulence ◽  
Vertical Structure ◽  
Structure Characteristic ◽  
Turbulence Structure ◽  
Optical Turbulence ◽  
Wavefront Analysis ◽  
Micrometeorological Measurements

The paper focuses on the investigations of the optical turbulence structure. The distributions of the repeatability of the structure characteristic of the air refractive index are obtained. A scenario of decreasing the intensity of the optical turbulence in the summer is discussed. Numerical estimates of this scenario are given. Using classical methods of wavefront analysis, the results of the first studies of the vertical structure of atmospheric turbulence at the Baykal astrophysical observatory site are presented.

scholarly journals ANÁLISE DA ESTRUTURA VERTICAL DO BALANÇO DE ENERGIA CINÉTICA TURBULENTA DURANTE A OCORRÊNCIA DE EVENTOS DE INTERMITÊNCIA GLOBAL

2016 ◽  
Vol 38 ◽  
pp. 406
Author(s):  
Thaís Freitas Dill ◽  
Adriano Battisti ◽  
Felipe Denardin Costa ◽  
Luiz Eduardo Medeiros ◽  
Viviane Da Silva Guerra
Keyword(s):  
Experimental Data ◽  
Vertical Structure ◽  
Sampling Frequency ◽  
Turbulence Structure ◽  
Shear Surface ◽  
Dominant Term ◽  
Near Surface ◽  
M 10 ◽  
Vertical Turbulence

This study aims to analyze the vertical structure of the terms of the ECT balance equation for the occurrence of intermittent events generated in surface and propagate upward. In order to verify that the dominant terms and the role of each term during such events. It was used FLOSSII experimental data collected in seven vertical levels (1 m, 2 m, 5 m, 10 m, 15 m, 20 m and 30 m) and have a sampling frequency of 60 Hz. The study period comprises between 20 November 2002 to 02 April 2003 and of that total, this study, we analyzed 108 nights. The majority of events generated surface (EB) are very weak compared to the events generated at the top of the tower layer and propagate down. The analyzes made by vertical turbulence structure and ECT balance for the EB’s showed that the dominant term near surface is the mechanical production. Thus, with increasing shear surface, producing turbulence and consequently, the transport of works term “loading” turbulence to higher levels of the atmosphere.

scholarly journals Energy Dissipation Rates of Turbulence with an Airborne Microwave Refractometer

1991 ◽  
Vol 44 (4) ◽  
pp. 435
Author(s):  
SBSS Sarma
Keyword(s):  
Refractive Index ◽  
Energy Dissipation ◽  
Vertical Gradient ◽  
Turbulence Energy ◽  
Turbulence Structure ◽  
Free Atmosphere ◽  
Dissipation Rates ◽  
Turbulence Energy Dissipation ◽  
Wind Shears ◽  
Time Basis

Estimates of turbulence energy dissipation rates have been obtained in the free atmosphere of the planetary boundary layer. These are derived in terms of the variance of radio refractive index fluctuations {Lln2 }, the Brunt-Vaisala frequency N, the mean vertical gradient of generalised potential refractive index M, and the turbulence structure parameter C~, using an airborne microwave refractometer. The energy dissipation rates thus derived are comparable with the results from other experiments. The inferred energy dissipation rates (on a near real-time basis) from the airborne microwave refractometer. are useful for detection and warning of wind shears in the atmosphere.

A Mobile Method for Measuring Atmospheric Diffusion *

1952 ◽  
Vol 33 (5) ◽  
pp. 188-194 ◽  
Author(s):  
J. D. Sartor ◽  
I. Katz ◽  
R. E. Katz
Keyword(s):  
Refractive Index ◽  
Motion Picture ◽  
Diffusion Coefficients ◽  
Vertical Structure ◽  
Yield Data ◽  
Atmospheric Diffusion ◽  
Vital Part

Interest of the radio-meteorologist centers on diffusion because the vertical structure and the non-homogeneity of the atmosphere, in terms of refractive index, play a vital part in radar propagation. A portable method of measuring diffusion consists of lifting smoke-puff generators aloft with tethered balloons, setting off puffs remotely and photographing them with two motion picture cameras. From the resulting records of the areal spread of the smoke and the distance it travels, one may compute values of diffusion coefficients. Preliminary experiments yield data in accord with values published by Sutton.

Measurements of atmospheric-turbulence-structure parameter using a space-limited laser beam

1980 ◽  
Vol 5 (2) ◽  
pp. 67 ◽  
Author(s):  
M. S. Belen’kii ◽  
V. V. Boronoev ◽  
N. Ts. Gomboev ◽  
V. L. Mironov
Keyword(s):  
Laser Beam ◽  
Atmospheric Turbulence ◽  
Turbulence Structure ◽  
Structure Parameter
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