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| Titel |
Equatorial Spread F structures and associated airglow intensity variations observed over Gadanki |
| VerfasserIn |
R. Sekar, D. Chakrabarty, R. Narayanan, A. K. Patra |
| 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 ; 26, no. 12 ; Nr. 26, no. 12 (2008-12-02), S.3863-3873 |
| Datensatznummer |
250016315
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3863-2008.pdf |
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| Zusammenfassung |
| Co-ordinated campaigns have been conducted from Gadanki
(13.5° N, 79.2° E, dip lat 6.4° N) by operating
simultaneously the Indian MST radar in ionospheric coherent
backscatter mode and by monitoring thermosphere airglow line
emissions (630.0 nm and 777.4 nm) using a narrow band
multi-wavelength scanning photometer during January-March for the
past five years (2003–2007) and also during April 2006, as a
special campaign. Simultaneous radar and optical observations
reveal optical signatures corresponding to a variety of equatorial
spread F (ESF) structures. The optical signatures corresponding to
ESF structures with wave-like bottomside modulations with plasma
plumes, confined bottomside flat and wavelike structures,
vertically extended plume structure in the absence of bottomside
structure apart from the classical plasma depletions and
enhancements are obtained during these campaigns. The plasma
depletions and enhancements were identified using optical
measurements. In addition, estimations of zonal wavelength of the
bottomside structures and the inference of shears in the zonal
plasma drift in the presence of confined structures, were carried
out using bi-directional airglow measurements. Furthermore, it is
found that the vertical columnar intensity of OI 630.0 nm airglow
exceeded the slanted columnar intensity in the presence of large
bottomside structure. The need for the appropriate physical
mechanisms for some of the ESF structures and their
characterizations with optical observations are discussed. |
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