Absolute reflectivities and aspect sensitivities of VHF radio wave scatterers measured with the SOUSY radar

Details Absolute reflectivities and aspect sensitivities of VHF radio wave scatterers measured with the SOUSY radar Absolute reflectivities and aspect sensitivities of VHF radio wave scatterers measured with the SOUSY radar

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..131h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, Feb. 1986, p. 131-144.

Physics

48

Atmospheric Scattering, Radar Measurement, Reflectance, Very High Frequencies, Atmospheric Turbulence, Radar Echoes, Scattering Cross Sections, Stratosphere, Tropopause, Vertical Distribution

Scientific paper

By accurately calibrating the SOUSY radar in West Germany it has been made possible to measure absolute values of effective reflection coefficients and turbulence structure constants. Some typical values of these parameters as a function of altitude are presented. Such profiles are presented for both a vertically directed beam, and also for two beams directed 7 deg off-vertical. Comparisons of powers on the vertical and off-vertical beams show that scatter became more aspect sensitive at the tropopause and in the lower stratosphere, but, unexpectedly, scatter was observed to become considerably more isotropic in the higher regions of the stratosphere (above 15-18 km) on this occasion. An enhancement of signal from the tropopause occured not only on the vertical beam, but also on the off-vertical beams. Comparisons of signal strengths scattered from the mesosphere and measured with the vertical and off-vertical beams showed that for the present observations mesospheric scatter was close to isotropic. The backscatter cross-sections at VHF have been compared with other measurements at medium and high frequencies at other locations, and these comparisons help set some limits on the scales of turbulent and specular scatterers in the mesosphere.

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