HR: 1400h
AN: SH23B-03    [Abstracts]
TI: On the Physical Origin of the Cycles in Long-term Modulation of Solar Activity
AU: * Duhau, S
EM: duhau@df.uba.ar
AF: Physics Department, Buenos Aires University, Ciudad Universitaria, Pab I, Buenos Aires, 1428,
AU: de Jager, C
EM: cdej@kpnplanet.nl
AF: Royal Netherlands Institute for Sea Research, P.O. Box 59, Den Burg, 1790 AB, Netherlands
AB: By a Morlet wavelet analysis in sub harmonics of the 11 year fundamental frequency of sunspot number as a proxy for the toroidal component of solar dynamo magnetic field the evolution for the last 400 years of four well defined cycles- a decadal, a semi-secular, the Gleissberg and the Suess ones - in the modulation of this component of the solar dynamo field is found. The properties of these cycles as seen in geomagnetic index aa and Si as proxy data for polar dynamo field and CME's frequency and intensity, respectively, are described . From this procedure and by analyzing longer proxy time series in the light of the known non-linear properties of solar dynamo system, the meaning of the four cycles and its variability are discussed.
DE: 7511 Coronal holes
DE: 7514 Energetic particles (2114)
DE: 7536 Solar activity cycle (2162)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Joint Assembly