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New findings increasing solar trend that can change Earth climate

Published online by Cambridge University Press:  26 February 2010

Jean-Pierre Rozelot
OCA-Fizeau Dpt, CNRS UMR 6525, & Université de Nice-Sophia-Antipolis, Av. Copernic, 06130 Grasse, France email:
Cilia Damiani
INAF-Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone (Italia) email:
Sandrine Lefebvre
Université Versailles St-Quentin; UPMC Univ. Paris 06; CNRS/INSU, LATMOS-IPSL, Tour 45-46/4ème étage, 4 place Jussieu, 75252 PARIS cedex 05, France email:
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Early attempts to find how solar activity can influence the Earth's climate involved comparison of many physical processes, such as dynamo mechanism, magnetic reconnection and eruptive activity, irradiance, open flux and particles variations, global atmospheric chemistry and dynamics.. . . However, such direct links seem to be weak even if the solar effects has been found to be stronger during extended maxima or minima of solar activity. Thus, temporal scales ranging from days to thousand of years must be investigated. A description of the most recent results on solar variability and its possible influence on the Earth's climate and atmosphere will be here addressed, with a particular emphasize on modulations of about 120 years (and harmonics). The extrapolation indicates a significant negative decrease of the solar signal, and consequently a decrease of the global Earth's temperature in the forthcoming years. Such a modulation is also testifying by other means, such as spectral observations of temperature sensitive lines indicating a decline of solar activity around 2015 (up to a new prolonged minimum). Prediction of global effects from the Sun's influence over the climate is thus planted in a new way.

Contributed Papers
Copyright © International Astronomical Union 2010


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