La hipótesis planetaria y las frecuencias sub-Milankovitch

COMPAGNUCCI, R. H.; CIONCO R. G,; AGOSTA, E. A.; WANNER, HEINZ

San Miguel de Tucumán

Congreso; XXVI Reunión Científica de la Asoc. Argentina de Geofísicos y Geodestas (AAGG).; 2012

The Planetary Hypothesis of solar cycles, proposes that the movement of the Sun around the solar systembarycenter modulates the solar cycles at several times scales. Using a 3-D model of the solar system werederived solar barycentric motion and various dynamic parameters such as angular momentum (L= Lx, Ly,Lz) for the Holocene. Angular momentum inversions, are sporadic and important events in the dynamicsof the MSB: Lz becomes negative and giant planets are nearly aligned. These episodes are related to somesolar grand minima: Maunder and Dalton, and also to the recent deep minimum 2007-2010 which waspreceded by a Lz inversion in 1990.During Holocene, occur several negative Lz episodes that are grouped in approximately a millennium tocenturies period. Each group is separated by ~2000 years where Lz values remain positive, bothgenerating a cycle between 1500 to 2500 years. The spectrum analysis show significant peaks at sub-Milankovitch frequencies. The Lz time series of the past 11,000 years is analyzed in relation to the majorclimate change, volcanism and geomagnetism.