Sporadic E layer at mid-latitudes: average properties and influence of atmospheric tides
作者： A. Pignalberi , M. Pezzopane , E. Zuccheretti
DOI: 10.5194/ANGEO-32-1427-2014
关键词: Geology 、 Middle latitudes 、 Atmospheric sciences 、 Noon 、 Sporadic E propagation 、 Atmospheric tide 、 Solar cycle 24 、 Ionosphere 、 Daytime 、 Diurnal temperature variation
摘要: Abstract. This paper describes a study of the daily variability shown by main characteristics sporadic E (Es) layer, that is top frequency (ftEs) and lowest virtual height (h'Es). The based on ionograms recorded Advanced Ionospheric Sounder Istituto Nazionale di Geofisica e Vulcanologia (AIS-INGV) ionosondes installed in ionospheric stations at Rome (41.8° N, 12.5° E) Gibilmanna (37.9° 14.0° E), Italy, during summer (June, July, August September) 2013, year falling ascending phase solar cycle 24. ftEs presents diurnal variation characterized two maxima, first around noon very well defined second evening/night much less defined; amplitude both maxima decreases from June to September accompanied general decrease values which more pronounced daytime than nighttime. h'Es also but, unlike ftEs, these present same independent considered month. Assuming trends are influenced atmospheric tides, height–time–intensity (HTI) technique was applied deeply investigate how waves control Es dynamics. HTI study, along with fast Fourier transform analysis, show well-defined semidiurnal periodicity characterizes layer dynamics most accurately while becomes weaker role consequently highlighted.
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