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| Titel |
Mid-latitude E-region bulk motions inferred from digital ionosonde and HF radar measurements |
| VerfasserIn |
G. C. Hussey, C. Haldoupis, A. Bourdillon, J. Delloue, J. T. Wiensz |
| 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. 11 ; Nr. 22, no. 11 (2004-11-29), S.3789-3798 |
| Datensatznummer |
250015049
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3789-2004.pdf |
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| Zusammenfassung |
| In the mid-latitude E-region there is now evidence suggesting that neutral
winds play a significant role in driving the local plasma instabilities and
electrodynamics inside sporadicE layers. Neutral winds can be inferred
from coherent radar backscatter measurements of the
range-/azimuth-time-intensity (RTI/ATI) striations of quasi-periodic (QP)
echoes, or from radar interferometer/imaging observations. In addition,
neutral winds in the E-region can be estimated from angle-of-arrival
ionosonde measurements of sporadic-E layers. In the present paper we
analyse concurrent ionosonde and HF coherent backscatter observations
obtained when a Canadian Advanced Digital Ionosonde (CADI) was operated
under a portion of the field-of-view of the Valensole high frequency (HF)
radar. The Valensole radar, a mid-latitude radar located in the south of
France with a large azimuthal scanning capability of 82° (24° E to 58° W), was used to deduce zonal bulk
motions of QP echoing regions using ATI analysis. The CADI was used to
measure angle-of-arrival information in two orthogonal horizontal directions
and thus derive the motion of sporadic-E patches drifting with the neutral
wind. This paper compares the neutral wind drifts of the unstable sporadic-E patches
as determined by the two instruments. The CADI measurements show a
predominantly westward aligned motion, but the measured zonal drifts are
underestimated relative to those observed with the Valensole radar. |
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