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| Titel |
Different long-term trends of the oxygen red 630.0 nm line nightglow intensity as the result of lowering the ionosphere F2 layer |
| VerfasserIn |
N. B. Gudadze, G. G. Didebulidze, L. N. Lomidze, G. Sh. Javakhishvili, M. A. Marsagishvili, M. Todua |
| 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. 8 ; Nr. 26, no. 8 (2008-07-31), S.2069-2080 |
| Datensatznummer |
250016170
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2069-2008.pdf |
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| Zusammenfassung |
| Long-term observations of total nightglow intensity of the atomic oxygen red
630.0 nm line at Abastumani (41.75° N, 42.82° E) in 1957–1993 and
measurements of the ionosphere F2 layer parameters from the Tbilisi
ionosphere station (41.65° N, 44.75° E) in 1963–1986 have been
analyzed. It is shown that a decrease in the long-term trend of the mean
annual red 630.0 nm line intensity from the pre-midnight value (+0.770±1.045 R/year)
to its minimum negative value (−1.080±0.670 R/year) at the midnight/after midnight is a possible result of the observed
lowering of the peak height of the ionosphere F2 layer electron density
hmF2 (−0.455±0.343 km/year). A theoretical simulation is carried out using
a simple Chapman-type layer (damping in time) for the height distribution of
the F2 layer electron density. The estimated values of the lowering in the
hmF2, the increase in the red line intensity at pre-midnight and its decrease at
midnight/after midnight are close to their observational ones, when a
negative trend in the total neutral density of the upper atmosphere and an
increase in the mean northward wind (or its possible consequence – a
decrease in the southward one) are assumed. |
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