Wind velocity measurements with acoustic daylight.

2010 ◽  
Vol 127 (3) ◽  
pp. 2037-2037
Author(s):  
Oleg A. Godin ◽  
Vladimir G. Irisov ◽  
Mikhail I. Charnotskii
Keyword(s):  
Wind Velocity ◽  
Velocity Measurements

Solar Orbiter observations of solar wind current sheets and their deHoffman-Teller frames

2021 ◽  
Author(s):  
Konrad Steinvall ◽  
Yuri Khotyaintsev ◽  
Giulia Cozzani ◽  
Andris Vaivads ◽  
Christopher Owen ◽  
...  
Keyword(s):  
Solar Wind ◽  
Electric Field ◽  
Wind Velocity ◽  
Solar Wind Velocity ◽  
Field Measurements ◽  
Velocity Measurements ◽  
Current Sheets ◽  
Spacecraft Orbit ◽  
Electric Field Measurements ◽  
Good Agreement

<p>Solar wind current sheets have been extensively studied at 1 AU. The recent advent of Parker Solar Probe and Solar Orbiter (SolO) has enabled us to study these structures at a range of heliocentric distances.</p><p>We present SolO observations of current sheets in the solar wind at heliocentric distances between 0.55 and 0.85 AU, some of which show signatures of ongoing magnetic reconnection. We develop a method to find the deHoffman-Teller frame which minimizes the Y-component (the component tangential to the spacecraft orbit) of the electric field. Using the electric field measurements from RPW and magnetic field measurements from MAG, we use our method to determine the deHoffman-Teller frame of solar wind current sheets. The same method can also be used on the Alfvénic turbulence and structures found in the solar wind to obtain a measure of the solar wind velocity.</p><p>Our preliminary results show a good agreement between our modified deHoffmann-Teller analysis based on the single component E-field, and the conventional deHoffman-Teller analysis based on 3D plasma velocity measurements from PAS. This opens up the possibility to use the RPW and MAG data to obtain an estimate of the solar wind velocity when particle data is unavailable.</p>

Sodar Wind Velocity Measurements of Offshore Turbine Wakes

2001 ◽  
Vol 25 (5) ◽  
pp. 301-306 ◽  
Author(s):  
L. Folkerts ◽  
R. Barthelmie ◽  
P. Sanderhoff ◽  
F. Ormel ◽  
P. Eecen ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Velocity Measurements

Comparison of solar wind velocity measurements with a theoretical acceleration model

1991 ◽  
Vol 96 (A8) ◽  
pp. 13849-13859 ◽  
Author(s):  
W. A. Coles ◽  
Ruth Esser ◽  
Unni-Pia Løvhaug ◽  
Jussi Markkanen
Keyword(s):  
Solar Wind ◽  
Wind Velocity ◽  
Solar Wind Velocity ◽  
Velocity Measurements ◽  
Acceleration Model

scholarly journals Performance and Technique of Coherent 2-μm Differential Absorption and Wind Lidar for Wind Measurement

2013 ◽  
Vol 30 (3) ◽  
pp. 429-449 ◽  
Author(s):  
Hironori Iwai ◽  
Shoken Ishii ◽  
Ryoko Oda ◽  
Kohei Mizutani ◽  
Shinya Sekizawa ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Signal To Noise Ratio ◽  
Sonic Anemometer ◽  
Correlation Coefficients ◽  
Co2 Concentration ◽  
Horizontal Wind ◽  
Doppler Lidar ◽  
Differential Absorption ◽  
Velocity Measurements ◽  
Wind Lidar

Abstract A coherent 2-μm differential absorption and wind lidar (Co2DiaWiL) has been built with a high-power Q-switched Tm,Hm:YLF laser to measure CO2 concentration and radial wind speed. The performance of the Co2DiaWiL is described and analyzed, with a view to demonstrating system capabilities for remote measurements of wind velocities in the atmospheric boundary layer and free troposphere. Bias in the velocity measurements was estimated at −0.0069 m s−1 using measurements from a stationary hard target. The Co2DiaWiL achieved a velocity precision of 0.12 m s−1, derived from the magnitude of random error in radial wind velocity measurements. These measurements were made for ranges out to 20–25 km by using a horizontally fixed beam mode for average times of 1 min. Quantitative intercomparisons of 1-min averages between the Co2DiaWiL and a sonic anemometer revealed a correlation coefficient of 0.99. This study demonstrated measurements of horizontal wind profiles, by making radial wind velocity measurements with the Co2DiaWiL using conical scanning. Profile differences at higher levels could be attributed to probable large horizontal separations of the radiosondes and the low signal-to-noise ratio of the Co2DiaWiL. A pseudo-dual-Doppler technique was developed to retrieve horizontal wind components with a single-Doppler lidar and a steering mirror. Intercomparisons of the 1-min-averaged u and υ components from the pseudo-dual-Doppler lidar measurements with those from the sonic anemometer revealed correlation coefficients of 0.84 and 0.83, respectively.

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