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| Titel |
Eastward traverse of equatorial plasma plumes observed with the Equatorial Atmosphere Radar in Indonesia |
| VerfasserIn |
S. Fukao, T. Yokoyama, T. Tayama, M. Yamamoto, T. Maruyama, S. Saito |
| 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 ; 24, no. 5 ; Nr. 24, no. 5 (2006-07-03), S.1411-1418 |
| Datensatznummer |
250015557
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| Publikation (Nr.) |
 copernicus.org/angeo-24-1411-2006.pdf |
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| Zusammenfassung |
| The zonal structure of radar backscatter plumes
associated with Equatorial Spread F (ESF), probably
modulated by atmospheric gravity waves, has been investigated
with the Equatorial Atmosphere Radar (EAR) in West Sumatra, Indonesia
(0.20° S, 100.32° E; dip latitude 10.1° S)
and the FM-CW ionospheric sounders on the same magnetic meridian as the EAR.
The occurrence locations and zonal distances of the ESF plumes
were determined with multi-beam observations with the EAR.
The ESF plumes drifted eastward
while keeping distances of several hundred to a thousand kilometers.
Comparing the occurrence of the plumes and
the F-layer uplift measured by the FM-CW sounders,
plumes were initiated within the scanned area around sunset
only, when the F-layer altitude rapidly increased.
Therefore, the PreReversal Enhancement (PRE) is considered as
having a zonal variation with the scales mentioned above,
and this variation causes day-to-day variability, which has
been studied for a long time. Modulation of the underlying
E-region conductivity by gravity waves,
which causes inhomogeneous sporadic-E layers, for example,
is a likely mechanism to determine the scale of the PRE. |
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