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STUDIO DEI PROCESSI DI SINTESI E CARATTERIZZAZIONE DEI NANOTUBI IN CARBONIO PER APPLICAZIONI NEI COMPOSITI POLIMERICI AVANZATI
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SYNTHESIS AND CHARACTERIZATION OF CARBON NANOTUBES FOR ADVANCED COMPOSITE MATERIALS AND SPACE STRUCTURES
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Signatures of the ULF geomagnetic activity in the surface air temperature in Antarctica
Full text linkThe variations of the Pc5 and Pc1-2 ULF power and surface air temperature measured at Terra
Nova Bay in Antarctica have been analyzed during the late declining phase of solar cycle 23 (2007–2008),
in comparison with the simultaneous variations of the solar wind speed. The analysis focused on time scales of
several days, which characterize the evolution of the solar wind stream structure. The temperature variations
appear clearly during the local winters, while they are strongly reduced in the sunlit summers. During the
local winters, the Pc5 and Pc1-2 power and the temperature variations are significantly correlated, with the
temperature delayed by a few days with respect to the ULF power. A time-frequency analysis revealed
common signals in the temperature and ULF power at periodicities related to the Sun’s rotation period (~27,
13.5, and 9 days), which, in the same time intervals, characterize the solar wind speed and geomagnetic activit
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