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| Titel |
Equatorial 150 km echoes and daytime F region vertical plasma drifts in the Brazilian longitude sector |
| VerfasserIn |
F. S. Rodrigues, E. B. Shume, E. R. de Paula, M. Milla |
| 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 ; 31, no. 10 ; Nr. 31, no. 10 (2013-10-31), S.1867-1876 |
| Datensatznummer |
250086136
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1867-2013.pdf |
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| Zusammenfassung |
| Previous studies showed that conventional coherent backscatter radar
measurements of the Doppler velocity of the so-called 150 km echoes can
provide an alternative way of estimating ionospheric vertical plasma drifts
during daytime hours (Kudeki and Fawcett, 1993; Chau and
Woodman, 2004). Using observations made by a
small, low-power 30 MHz coherent backscatter radar located in the equatorial
site of São Luís (2.59° S, 44.21° W; −2.35°
dip lat), we were able to detect and monitor the occurrence of 150 km echoes
in the Brazilian sector. Using these measurements we estimated the local time
variation of daytime vertical ionospheric drifts in the eastern American
sector. Here, we present a few interesting cases of 150 km-echoes
observations made by the São Luís radar and estimates of the diurnal
variation of vertical drifts. These cases exemplify the variability of the
vertical drifts in the Brazilian sector. Using same-day 150 km-echoes
measurements made at the Jicamarca Radio Observatory in Peru, we also
demonstrate the variability of the equatorial vertical drifts across the
American sector. In addition to first estimates of the absolute vertical
plasma drifts in the eastern American (Brazilian) sector, we also present
observations of abnormal drifts detected by the São Luís radar associated
with the 2009 major sudden stratospheric warming event. |
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