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| Titel |
Airglow observations over the equatorial ionization anomaly zone in Taiwan |
| VerfasserIn |
J. Y. Liu, P. K. Rajesh, I. T. Lee, T. C. Chow |
| 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 ; 29, no. 5 ; Nr. 29, no. 5 (2011-05-05), S.749-757 |
| Datensatznummer |
250017010
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| Publikation (Nr.) |
 copernicus.org/angeo-29-749-2011.pdf |
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| Zusammenfassung |
| Airglow imaging at mid-latitude stations often show intensity modulations
associated with medium scale travelling ionospheric disturbances (MSTID),
while those carried out near the equatorial regions reveal depletions caused
by equatorial plasma bubbles (EPB). Two all sky cameras are used to observe
plasma depletions in the 630.0 nm emission over the equatorial ionization
anomaly (EIA) region, Taiwan (23° N, 121° E; 13.5° N Magnetic)
during 1998–2002 and 2006–2007. The results show EPB and MSTID depletions in
different solar activity conditions. Several new features of the EPB
depletions such as bifurcation, secondary structure on the walls, westward
tilt, etc., are discussed in this paper. Evidence of tilted depletions with
secondary structures developing on the eastern wall that later evolve to
appear as bifurcations, are presented for the first time. Moreover, detail
investigations are carried out using International Reference Ionosphere
(IRI) model as well as the electron density from Ionosonde and Global
Positioning System (GPS) Occultation Experiment (GOX) onboard
FORMOSAT-3/COSMIC satellite, to understand the conditions that favor the
propagation of MSTID to the latitude of Taiwan. |
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