Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11.1033r&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 11/12, p. 1033-1050
Physics
8
Convective Flow, Flow Velocity, Multistatic Radar, Plasma Drift, Very High Frequencies, Computerized Simulation, Doppler Effect, Error Analysis, Plasma Diagnostics, Propagation Velocity
Scientific paper
The results of model calculations are presented which simulate the errors in the estimation of plasma drift velocities measured by coherent VHF bistatic auroral radar systems sensitive to E-region plasma irregularities. The Doppler velocity data from such radars is commonly analysed by utilizing a cosine rule reduction technique. There is now a considerable amount of evidence to suggest that the cosine rule is, in general, not valid for E-region backscatter. The strongest E-region radar backscatter signals are thought to be caused by modified two stream instability waves which propagate at speeds close to the local ion acoustic speed and not, as was previously believed, at speeds close to the component of the flow velocity in the direction of the beam. As a result of the breakdown of the cosine rule, systematic errors rise in the estimation of both flow speeds and flow angles, by coherent VHF bistatic radar systems. The model presented here incorporates a nonlinear theory of radar auroral backscatter from which backscatter irregularity phase speeds may be calculated for a variety of flow conditions. This allows radar Doppler velocities and corresponding cosine rule estimates to be simulated. In this way, the effects of beam geometry, flow speed and backscatter altitudes and aspect angles on the errors which arise in flow estimation based on the cosine rule are evaluated theoretically.
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