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The determination of time-stationary two-dimensional convection patterns with single-station radarsA 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.
Document ID
19910067359
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Freeman, M. P.
(Johns Hopkins Univ. Laurel, MD, United States)
Ruohoniemi, J. M.
(Johns Hopkins Univ. Laurel, MD, United States)
Greenwald, R. A.
(Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
91A51982
Funding Number(s)
CONTRACT_GRANT: NAG5-1099
CONTRACT_GRANT: NSF DPP-86-02975
CONTRACT_GRANT: NSF ATM-87-13982
Distribution Limits
Public
Copyright
Other

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