Solar activity and space weather effects on Earth's thermosphere.
Berrilli F., Cauli C., Lovric M., Bigazzi A., Colace M., Del Moro D., Giovannelli L.
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IV - Geofisica e fisica dell'ambiente
Aula 32C-1 - Mercoledì 19 h 09:00 - 13:00
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The solar irradiance changes on various time scales, the most prominent is the quasi-11-year. UV variability is crucial to describe solar effects on thermosphere. Solar activity and geomagnetic indices (e.g., Mg II, F10.7 and Ap) were used to study the impact of solar activity on thermosphere density during ESA's mission GOCE (rising phase of solar cycle 24). The signals associated to activity indices and thermosphere density were correlated and successively decomposed in Intrinsic Mode Functions (IMF) through the Empirical Mode Decomposition (EMD) technique. GOCE thermosphere density was reconstructed through an optimized combination of IMFs and compared with the original dataset.