HR: 0800h
AN: GC31B-0340    [Abstracts]
TI: Study Of Oscillations In Solar – Terrestrial Variables Associated To Magnetic Flux Emergence
AU: * Silva, A M
EM: adriansilva@fibertel.com.ar
AF: Universidad de Buenos Aires, Cbc, Departament V Physics, Ciudad Universitaria, Pab III, Planta Baja, Capital Federal, Argentina, Buenos Aires, CF 1428, Argentina
AU: * Silva, A M
EM: adriansilva@fibertel.com.ar
AF: Instituto de Astronom\´{i}a y F\´{i}sica del Espacio, Conicet UBA, Ciudad Universitaria S/N, Capital Federal, Argentina, Buenos Aires, CF 1428, Argentina
AB: The aim of this research is to track a fundamental oscillation in the solar activity, through the global earth temperature and geomagnetic storms sudden commencement SSC ( as solar -terrestrial link), and the geomagnetic index aa, and its temporal evolution. Also, the chaotic changes of the solar dynamo levels are analized in the terrestrial variables. The cited oscillation is associated to magnetic flux emergence, that is in turn a link between solar activity and space – earth weather. Hence, the monitoring of these signals can be a usefull tool in the terrestrial parameters forecast. In this work we show the results of the multiresolved wavelet analysis of oscillations with periods in the 100 to 1000 days range in the sunspot areas, solar number Rz, SSC index, earth average temperature Tav and geomagnetic index aa, for the solar cycles 19 to the cycle 24 beginning. I have discovered the excitation of submodes of the 160 days wave in all the solar cycles considered. This wave set also appears with a corresponding lags in the terrestrial variables. The relative intensity of normalized harmonics is analyzed, since it could be a important clue to understand the evolution of this plasma wave. From a chaotic increase in the solar activity level ocurred during 1920 to 1930, the 160 days wave is excited, and the process that drives to cascades of energy flares begins, as those starting from the cycle 19, that affect the terrestrial space climate drastically. It is found that the amplitude of the terrestrial variables change together, affected by the increasing switch in the solar dynamo process. An existing model that correlates the SSC index and Tav is tested and modified for cycle 23 and the start of 24. This approach explains almost the 75 percent of variations of global earth temperature. A general discussion of several founded correlations is made.
UR: http://www.espaciotiempo.org
DE: 1650 Solar variability (7537)
DE: 7538 Solar irradiance
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting