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| Titel |
An assessment of the "map-potential" and "beam-swinging" techniques for measuring the ionospheric convection pattern using data from the SuperDARN radars |
| VerfasserIn |
G. Provan, T. K. Yeoman, S. E. Milan, J. M. Ruohoniemi, R. Barnes |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 2 ; Nr. 20, no. 2, S.191-202 |
| Datensatznummer |
250014355
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| Publikation (Nr.) |
 copernicus.org/angeo-20-191-2002.pdf |
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| Zusammenfassung |
The SuperDARN HF coherent
scatter radars (Greenwald et al., 1995) provide line-of-sight (l-o-s) velocity
measurements of ionospheric convection flow over the polar regions of the
northern and southern hemispheres. A number of techniques have been developed
in order to obtain 2-D plasma flow vectors from these l-o-s observations. This
study entails a comparison of the ionospheric flow vectors derived using the
"map-potential", and "beam-swinging" techniques with the
vectors derived using the "merging" technique. The merging technique
is assumed to be the most accurate method of deriving local flow vectors from
l-o-s velocities. We can conclude that the map-potential model is significantly
more successful than the beam-swinging technique at estimating both the
magnitude and the direction of the large-scale ionospheric convection flow
vectors. The quality of the fit is dependent on time of day, with vectors
observed at low latitudes in the dawn sector agreeing most closely with the
merged vector flow pattern.
Key words. Ionosphere (plasma
convection; instruments and techniques) – Radio science (instruments and
techniques) |
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