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| Titel |
Variations of thermospheric composition according to AE-C data and CTIP modelling |
| VerfasserIn |
H. Rishbeth, R. A. Heelis, I. C. F. Müller-Wodarg |
| 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 ; 22, no. 2 ; Nr. 22, no. 2 (2004-01-01), S.441-452 |
| Datensatznummer |
250014774
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| Publikation (Nr.) |
 copernicus.org/angeo-22-441-2004.pdf |
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| Zusammenfassung |
Data from the Atmospheric Explorer C satellite, taken at middle and low latitudes in
1975-1978, are used to study latitudinal and month-by-month variations of thermospheric composition. The
parameter used is the "compositional Ρ-parameter", related to the neutral atomic oxygen/molecular
nitrogen concentration ratio. The midlatitude data show strong winter maxima of the atomic/molecular ratio,
which account for the "seasonal anomaly" of the ionospheric F2-layer. When the AE-C data are
compared with the empirical MSIS model and the computational CTIP ionosphere-thermosphere model,
broadly similar features are found, but the AE-C data give a more molecular thermosphere than do the
models, especially CTIP. In particular, CTIP badly overestimates the winter/summer change of
composition, more so in the south than in the north. The semiannual variations at the equator and in
southern latitudes, shown by CTIP and MSIS, appear more weakly in the AE-C data. Magnetic activity
produces a more molecular thermosphere at high latitudes, and at mid-latitudes in summer.
Key words. Atmospheric composition and structure (thermosphere
– composition and chemistry) |
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