CUPRI observations of PMSE during Salvo B of NLC-91: Evidence of both partial relfection and turbulent scatter

Details CUPRI observations of PMSE during Salvo B of NLC-91: Evidence of both partial relfection and turbulent scatter CUPRI observations of PMSE during Salvo B of NLC-91: Evidence of both partial relfection and turbulent scatter

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2291c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2291-2294

Computer Science

Sound

22

Atmospheric Boundary Layer, Atmospheric Turbulence, Doppler Radar, Mesosphere, Noctilucent Clouds, Polar Regions, Radar Echoes, Radar Measurement, Radar Scattering, Radial Velocity, Emission Spectra, Interferometers, Rocket-Borne Instruments, Sounding Rockets, Spectral Sensitivity, University Program, Wave Reflection

Scientific paper

During the first rocket sequence (called Salvo B) of the NLC-91 campaign, the Cornell University Portable Radar Interferometer (CUPRI) observed two simultaneously occurring layers of Polar Mesophere Summer Echoes (PMSE). during the time of the Turbo B flight, the high time-resolution CUPRI Doppler spectra exhibited sawtooth-like discontinuities in the lower layer which we interpret to be a distorted partial reflection layer which was advected across the radar beam. The upper layer, on the other hand, appeared to be caused by turbulent scatter and we estimate the turbulence energy dissipation rate in the upper layer at the time of the Turbo B flight to have been approximately 0.04 W/kg. Futhermore, a shift in the antenna beam direction from vertical to 8 deg off zenith revealed an aspect sensitivity of approximately 5 dB in the lower layer but none in the upper layer. We conclude that, at this particular time, turbulent scatter was responsible for the upper layer while some form of partial reflection was dominant in the lower layer.

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