Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jastp..68.1980e&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 68, Issue 17, p. 1980-1986.
Physics
Scientific paper
Running correlations between “ideal” periodic sine series, u(t) and y(t), are analyzed in the present work, which, in this case, results in a kind of beating of the two waves. u(t) is considered as a quasi-biennial periodic function standing for an idealized quasi-biennial oscillation (QBO). The beat frequency in the running correlation coefficient series will correspond to a decadal oscillation if periodicities in y(t) are around 0.6 0.8 years greater or 0.4 0.5 years smaller than u(t) period. The periodicities required by y(t) to generate a decadal variation in the running correlation with u(t), may appear in series associated to the 11-year solar activity cycle due to its asymmetry: solar activity rises to maximum levels faster than it falls to minimum levels. Therefore, running correlations between the stratosphere QBO and time series with a biennial or triennial oscillation, associated or not to the solar cycle, could present a decadal oscillation due merely to the statistics involved. Taking into account the idealization of the series considered, without any relationship or interaction between them, neither a decadal modulation in u(t), we obtain a quasi-decadal oscillation in running correlations, as that obtained when certain empirical data series are correlated with the QBO in the stratosphere.
de Artigas Marta Zossi
Elias Ana G.
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