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Gudadze, N. B. and Didebulidze, G.G. and Lomidze, L. N. and Javakhishvili, G. Sh. and Marsagishvili, M. A. and Todua, M. (2008) Different long-term trends of the oxygen red 630.0nm line nightglow intensity as the result of lowering the ionosphere F2 layer. Annales Geophysicae, 26. pp. 2069-2080. ISSN 0992-7689
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Abstract
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 premidnight 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.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculties/Schools > School of Natural Sciences and Engineering |
| Depositing User: | პროფესორი გოდერძი დიდებულიძე |
| Date Deposited: | 29 Jan 2014 19:47 |
| Last Modified: | 29 Jan 2014 19:47 |
| URI: | http://eprints.iliauni.edu.ge/id/eprint/706 |
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