The determination of time-stationary two-dimensional convection patterns with single-station radars

Details The determination of time-stationary two-dimensional convection patterns with single-station radars The determination of time-stationary two-dimensional convection patterns with single-station radars

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615735f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,735-15,749.

Mathematics

Logic

40

Auroral Electrojets, Convection Currents, Flow Distribution, Ionospheric Currents, Meteorological Radar, Coherent Radar, Doppler Effect, Flow Velocity, Incoherent Scatter Radar

Scientific paper

A critical examination of the accuracy of ionospheric vector velocity determinations, using realistic modeled flow patterns that are time-stationary but not spatially uniform, is presented. Under certain circumstances the actual and inferred flow fields are found to exhibit considerable discrepancy, sometimes not even agreeing in the sense of flow direction. It is shown that the natural curvature present in ionospheric convection on varying spatial scales can introduce significant error in the velocity estimate, particularly when the radius of curvature of the flow structure is less than or equal to the radar range to the scattering volume. It is argued that the ionospheric convection should be measured by bidirectional or multidirectional observations of a common ionospheric volume and that a synthesis of coherent and incoherent radar observations from different sites is preferable to multidirectional single-station observations using either radar alone.

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