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| Titel |
The formation of electron-temperature hot spots in the main ionospheric trough by the internal processes |
| VerfasserIn |
G. I. Mingaleva, V. S. Mingalev |
| 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 ; 14, no. 8 ; Nr. 14, no. 8, S.816-825 |
| Datensatznummer |
250012385
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| Publikation (Nr.) |
 copernicus.org/angeo-14-816-1996.pdf |
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| Zusammenfassung |
| A mathematical model of the convecting
high-latitude ionosphere is described which produces three-dimensional
distributions of electron density, positive-ion velocity and electron and ion
temperatures at the F-layer altitudes. The results of simulation of the
behaviour of the high-latitude ionosphere, in particular, the heat regime of the
F-layer, are presented and analysed. From our study, it was found that
electron-temperature hot spots in the main ionospheric trough can arise owing to
internal ionospheric processes, and not due to effects of any external causes.
Three conditions, to be satisfied simultaneously, are necessary for the
formation of the considered electron-temperature hot spots: first, low values of
electron density; second, solar illumination of the upper F region and darkness
of the lower F region; third, low values of neutral-component densities. These
conditions are valid in the main ionospheric trough near the terminator on the
nightside when the density of the neutral atmosphere is not high. The physical
processes which lead to the formation of the electron-temperature hot spots are
the heat transfer from the upper into the lower F region, the reduced heat
capacity of electron gas and the weakened cooling of electron gas due to
inelastic collisions with neutral atoms and molecules. Also investigated is the
influence of seasonal and solar-activity variations on the efficiency of the
identified mechanism responsible for the formation of the electron temperature
peaks in the main ionospheric trough by the internal processes. |
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