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| Titel |
Sporadic E layer at mid-latitudes: average properties and influence of atmospheric tides |
| VerfasserIn |
A. Pignalberi, M. Pezzopane, E. Zuccheretti |
| 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 ; 32, no. 11 ; Nr. 32, no. 11 (2014-11-21), S.1427-1440 |
| Datensatznummer |
250121133
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1427-2014.pdf |
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| Zusammenfassung |
| This paper describes a study of the daily variability shown by the main
characteristics of the sporadic E (Es) layer, that is the top frequency
(ftEs) and the lowest virtual height (h'Es). The study is based on ionograms
recorded by the Advanced Ionospheric Sounder by the Istituto Nazionale di Geofisica e Vulcanologia
(AIS-INGV) ionosondes installed in the ionospheric stations at
Rome (41.8° N, 12.5° E) and Gibilmanna (37.9° N,
14.0° E), Italy, during the summer (June, July, August and September) of 2013,
a year falling in the ascending phase of solar cycle 24. The ftEs presents a diurnal variation characterized
by two maxima, the first around noon is very well defined and the second
in the evening/night is much less defined; the amplitude of both maxima
decreases from June to September accompanied by a general decrease of the
ftEs values which is more pronounced in the daytime than in the nighttime.
h'Es also presents a diurnal variation characterized by two maxima but,
unlike ftEs, these present the same amplitude which is independent from the
considered month. Assuming that both ftEs and h'Es trends are influenced by
the atmospheric tides, the height–time–intensity (HTI) technique was applied
to deeply investigate how these waves control the Es dynamics. The HTI study,
along with a fast Fourier transform analysis, show that a well-defined
semidiurnal periodicity characterizes the Es layer dynamics most accurately in June
and July, while in August and September the daytime semidiurnal periodicity
becomes weaker and the role of the diurnal periodicity is consequently
highlighted. |
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