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| Titel |
Vibrational nitrogen concentration in the ionosphere and its dependence on season and solar cycle |
| VerfasserIn |
A. E. Ennis, G. J. Bailey, R. J. Moffett |
| 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 ; 13, no. 11 ; Nr. 13, no. 11, S.1164-1171 |
| Datensatznummer |
250012038
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| Publikation (Nr.) |
 copernicus.org/angeo-13-1164-1995.pdf |
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| Zusammenfassung |
| A fully time-dependent mathematical model,
SUPIM, of the Earth's plasmasphere is used in this investigation. The model
solves coupled time-dependent equations of continuity, momentum and energy
balance for the O+, H+, He+, N+2,
O+2, NO+ ions and electrons; in the present
study, the geomagnetic field is represented by an axial-centred dipole.
Calculation of vibrationally excited nitrogen molecules, which has been
incorporated into the model, is presented here. The enhanced model is then used
to investigate the behaviour of vibrationally excited nitrogen molecules with F10.7
and solar EUV flux, during summer, winter and equinox conditions. The presence
of vibrational nitrogen causes a reduction in the electron content. The diurnal
peak in electron content increases linearly up to a certain value of F10.7,
and above this value increases at a lesser rate, in agreement with previous
observations and modelling work. The value of F10.7 at which this change
in gradient occurs is reduced by the presence of vibrational nitrogen.
Vibrational nitrogen is most effective at F-region altitudes during summer
daytime conditions when a reduction in the electron density is seen. A lesser
effect is seen at equinox, and in winter the effect is negligible. The summer
reduction in electron density due to vibrational nitrogen therefore reinforces
the seasonal anomaly. |
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