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| Titel |
The F-layer at sunrise |
| VerfasserIn |
H. Rishbeth, B. Jenkins, 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. 4 ; Nr. 13, no. 4, S.367-374 |
| Datensatznummer |
250011817
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| Publikation (Nr.) |
 copernicus.org/angeo-13-367-1995.pdf |
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| Zusammenfassung |
| It was noticed 60 years ago that at sunrise (i)
the ionospheric critical frequency foF2 increases faster in winter than
in summer and (ii) the increase begins at a greater solar zenith angle in
winter. It was later suggested that this "seasonal sunrise anomaly" is
due to a seasonal change of atomic/molecular ratio in the neutral air in the
F2-layer. This paper uses the Sheffield University plasmasphere-ionosphere
computational model (SUPIM) with the MSIS thermosphere model to examine the
relative importance at sunrise of production, loss and diffusion processes, and
the effect of neutral air winds. The results show that both (i) and (ii) can be
explained in terms of neutral composition changes. |
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