scholarly journals Simultaneous MST radar and radiosonde measurements at Gadanki (13.5°N, 79.2°E) 2. Determination of various atmospheric turbulence parameters

Radio Science ◽  
2003 ◽  
Vol 38 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. K. Ghosh ◽  
A. R. Jain ◽  
V. Sivakumar
Keyword(s):  
Atmospheric Turbulence ◽  
Mst Radar ◽  
Turbulence Parameters

scholarly journals Experimental determination of thermal turbulence effects on a propagating laser beam

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Sphumelele C. Ndlovu ◽  
Naven Chetty
Keyword(s):  
Laser Beam ◽  
Atmospheric Turbulence ◽  
Laser Beams ◽  
Reliable Technique ◽  
Thermal Turbulence ◽  
Turbulence Effects ◽  
The Military ◽  
Atmospheric Systems ◽  
Turbulence Parameters

AbstractThe effect of turbulence on propagating laser beams has been a subject of interest since the evolution of lasers back in 1959. In this work, an inexpensive and reliable technique for producing interferograms using a point diffraction interferometer (PDI) was considered to experimentally study the turbulence effects on a laser beam propagating through air. The formed interferograms from a propagating beamwere observed and digitally processed to study the strength of atmospheric turbulence. This technique was found to be sensitive enough to detect changes in applied temperature with distance between the simulated turbulence and laser path. These preliminary findings indicated that we can use a PDI method to detect and localise atmospheric turbulence parameters. Such parameters are very important for use in the military (defence laser weapons) and this is vital for South Africa (SA) since it has natural resources, is involved in peace keeping and mediation for other countries, and hence must have a strong defence system that will be able to locate, detect and destroy incoming missiles and other threatening atmospheric systems in order to protect its environment and avoid the initiation of countermeasures on its land.

Estimating Atmospheric Turbulence Parameters from the Envelopes of Radio Acoustic Signals

2001 ◽  
Vol 55 (8) ◽  
pp. 5
Author(s):  
V. M. Kartashov ◽  
V. A. Petrov ◽  
Ye. G. Proshkin ◽  
G. I. Sidorov
Keyword(s):  
Atmospheric Turbulence ◽  
Acoustic Signals ◽  
Turbulence Parameters

scholarly journals Measurements of atmospheric turbulence with the dual-beamwidth method using the MST radar at Gadanki, India

2004 ◽  
Vol 22 (9) ◽  
pp. 3291-3297 ◽  
Author(s):  
G. D. Nastrom ◽  
P. B. Rao ◽  
V. Sivakumar
Keyword(s):  
Kinetic Energy ◽  
Atmospheric Turbulence ◽  
Traditional Method ◽  
Spectral Width ◽  
Effective Width ◽  
Prevailing Wind ◽  
Diurnal Range ◽  
Mst Radar ◽  
Diurnal Period ◽  
Beam Broadening

Abstract. A brief experiment was conducted during 24-29 April and 9-10 May 2002, using the MST radar at Gadanki, India, to test the dual-beamwidth method of estimating the turbulence kinetic energy (TKE). Because the beamwidth can be modified on only one polarization at a time at Gadanki, an elliptical beam was used with a modified dual-beamwidth analysis. Estimates of the TKE from the dual-beamwidth method and the traditional method are very similar in regions of light winds (<~10ms-1). In regions of stronger wind (>~15ms-1) the traditional method often gives TKE<0 because the beam-broadening correction is greater than the observed spectral width. It is suggested that some of the problems with the traditional method are due to the uncertainty in the effective width of the radar beam. In all regions the modified dual-beamwidth method gives TKE>0 on the beam parallel to the prevailing wind; on this beam the estimates depend only on the ratio of the beamwidths, which is presumably well-known, and the observed spectral widths. The values of TKE from the dual-beamwidth method are approximately constant with height at 0.2m2s-2 from about 5 to 7.5km during the afternoon during both April and May (all April observations were made between 9:00 and 17:00 local time), and then decrease rapidly to about 0.02m2s-2 by about 9km. The data from May extend over one full diurnal period and the diurnal range of TKE during this period is found to be about 5dB below about 12km and from about 15 to 19km, near the tropopause, with maximum values during local afternoon.

Atmospheric Turbulence Parameters from Visual Resolution

1975 ◽  
Vol 14 (4) ◽  
pp. 847 ◽  
Author(s):  
M. L. Wesely ◽  
Z. I. Derzko
Keyword(s):  
Atmospheric Turbulence ◽  
Visual Resolution ◽  
Turbulence Parameters

scholarly journals Characteristics of atmospheric turbulence in terms of background atmospheric parameters inferred using MST radar at Gadanki (13.5°N, 79.2°E)

Radio Science ◽  
2010 ◽  
Vol 45 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Siddarth Shankar Das ◽  
A. K. Ghosh ◽  
K. Satheesan ◽  
A. R. Jain ◽  
K. N. Uma
Keyword(s):  
Atmospheric Turbulence ◽  
Atmospheric Parameters ◽  
Mst Radar

Experimental determination of the effective structure-function parameter for atmospheric turbulence

1999 ◽  
Vol 105 (2) ◽  
pp. 912-914 ◽  
Author(s):  
D. K. Wilson ◽  
D. I. Havelock ◽  
M. Heyd ◽  
M. J. Smith ◽  
J. M. Noble ◽  
...  
Keyword(s):  
Structure Function ◽  
Experimental Determination ◽  
Atmospheric Turbulence ◽  
Function Parameter
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