Loading...
Please wait, while we are loading the content...
Similar Documents
A comparison of vertical velocities measured from specular and nonspecular echoes by a vhf radar
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Nastrom, G. D. Clark, W. L. Green, J. L. Warnock, J. M. |
| Copyright Year | 1986 |
| Description | For a number of years, there have been doubts about the accuracy of vertical wind velocities measured with quasi-specular reflections from mesosphere-stratosphere-troposphere (MST) radar. The concern has been that the layers producing the quasi-specular reflection process this hypothetical tilt. Because of the quasi-specular reflection process, this hypothetical tilt would control the effective zenith angle of the radar antenna beam so that a small component of the horizontal velocity would be included in what was assumed to be a truly vertical beam. The purpose here is to test the hypothesis that there is an effect on the wind velocities measured on a vertical antenna beam due to a long-term tilting of the stable atmospheric layers that cause quasi-specular reflection. Gravity waves have been observed to cause short-term tilting of turbulent layers and specularly reflecting layers. In both cases, the effect was a wave-like deformation atmospheric layers with a period of a few minutes. This geometry is shown. Because of this influence of gravity waves, it was expected that there would be short-term variations in the vertical velocity. |
| File Size | 245495 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870001037 |
| Archival Resource Key | ark:/13960/t92856v3p |
| Language | English |
| Publisher Date | 1986-06-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Meteorological Radar Deformation Variations Wind Velocity Measurement Angles Geometry Vertical Air Currents Atmospheric Turbulence Comparison Atmospheric Stratification Radar Scattering Very High Frequencies Radar Echoes Gravity Waves Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
