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| Titel |
Radar and satellite investigations of equatorial evening vertical drifts and spread F |
| VerfasserIn |
J. M. Smith, F. S. Rodrigues, E. R. de Paula |
| 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 ; 33, no. 11 ; Nr. 33, no. 11 (2015-11-11), S.1403-1412 |
| Datensatznummer |
250121268
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1403-2015.pdf |
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| Zusammenfassung |
| We analyzed pre-midnight equatorial F region observations made by the 30 MHz coherent backscatter radar of São Luis, Brazil between August 2010 and
February 2012. These measurements were processed, and used to create monthly
maps of the echo occurrence as a function of local time and height. The maps
show the inter-annual variability associated with equatorial spread F (ESF)
occurrence in the Brazilian longitude sector. We also constructed monthly
curves of the evening vertical drifts, for the Brazilian sector, using
measurements by the ion velocity meter (IVM) onboard the C/NOFS satellite.
The IVM evening drifts show a good overall agreement with the
Scherliess and Fejer (1999) empirical model. Measured and model drifts show the
development of the pre-reversal enhancement (PRE) of the vertical plasma
drifts during ESF season. Using joint radar and satellite measurements, we
found that evening (18:00–18:30 LT) mean non-negative drifts provide a
necessary but not sufficient condition for the occurrence of topside ESF
echoes. Evening downward (negative) drifts preceded the absence of topside
ESF irregularities. |
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