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| Titel |
A study of the ionogram derived effective scale height around the ionospheric hmF2 |
| VerfasserIn |
L. Liu, W. Wan, B. Ning |
| 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 ; 24, no. 3 ; Nr. 24, no. 3 (2006-05-19), S.851-860 |
| Datensatznummer |
250015516
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| Publikation (Nr.) |
 copernicus.org/angeo-24-851-2006.pdf |
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| Zusammenfassung |
| The diurnal, seasonal, and solar activity variations of
the ionogram derived scale height around the ionospheric F-layer peak (Hm)
are statistically analyzed at Wuhan (114.4° E, 30.6° N) and the yearly
variations of Hm are also investigated for Wuhan and 12 other stations where
Hm data are available. Hm, as a measure of the slope of the topside electron
number density profiles, is calculated from the bottomside electron density
profiles derived from vertical sounding ionograms using the UMLCAR
SAO-Explorer. Results indicate that the value of median Hm increases with
increasing solar flux. Hm is highest in summer and lowest in winter during
the daytime, while it exhibits a much smaller seasonal variation at night. A
common feature presented at these 13 stations is that Hm undergoes a yearly
annual variation with a maximum in summer during the daytime. The annual
variation becomes much weaker or disappears from late night to pre-sunrise. In
addition, a moderate positive correlation is found between Hm with hmF2 and
a strong correlation between the bottomside thickness parameter B0 and Hm.
The latter provides a new and convenient way for empirical modeling the
topside ionospheric shape only from the established B0 parameter set. |
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