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| Titel |
Simultaneous HF measurements of E- and F-region Doppler velocities at large flow angles |
| VerfasserIn |
R. A. Makarevitch, F. Honary, A. V. Koustov |
| 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 ; 22, no. 4 ; Nr. 22, no. 4 (2004-04-02), S.1177-1185 |
| Datensatznummer |
250014832
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| Publikation (Nr.) |
 copernicus.org/angeo-22-1177-2004.pdf |
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| Zusammenfassung |
Data collected by the CUTLASS Finland HF radar are used to
illustrate the significant difference between the cosine component
of the plasma convection in the F-region and the Doppler velocity
of the E-region coherent echoes observed at large flow angles. We
show that the E-region velocity is ~5 times smaller in
magnitude and rotated by ~30° clockwise with respect to
convection in the F-region. Also, measurements at flow angles
larger than 90° exhibit a completely new feature: Doppler
velocity increase with the expected aspect angle and spatial
anticorrelation with the backscatter power. By considering DMSP
drift-meter measurements we argue that the difference between
F- and E-region velocities cannot be interpreted in terms of the
convection change with latitude. The observed features in the
velocity of the E-region echoes can be explained by taking into
account the ion drift contribution to the irregularity phase
velocity as predicted by the linear fluid theory.
Key words. Ionosphere (auroral ionosphere; ionospheric irregularities;
plasma convection) |
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