HR: 1400h
AN: SH23B-02    [Abstracts]
TI: The 120-yrs solar cycle of the magnetic solar activity
AU: * Velasco Herrera, V
EM: vmv@geofisica.unam.mx
AF: INSTITUTO DE GEOFISICA, UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO, CIUDAD UNIVERSITARIA, CIRCUITO EXTERIOR, MEXICO DF, DF 04510, Mexico
AU: MENDOZA, B E
EM: blanca@geofisica.unam.mx
AF: INSTITUTO DE GEOFISICA, UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO, CIUDAD UNIVERSITARIA, CIRCUITO EXTERIOR, MEXICO DF, DF 04510, Mexico
AU: VALDES-GALICIA, J F
EM: jfvaldes@geofisica.unam.mx
AF: INSTITUTO DE GEOFISICA, UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO, CIUDAD UNIVERSITARIA, CIRCUITO EXTERIOR, MEXICO DF, DF 04510, Mexico
AB: The solar periodicities of 55 yrs (Yoshimura cycle), 80-88 yrs (Gleissberg cycle) and 205 yrs (Suess cycle) using different time series of proxies of solar activity have been reported in a great number of papers. In this work we present a more objective and general cycle-length determination applying the wavelet transformation based on the Morlet wavelet to the cosmogenic isotopes. We use the INTERCAL98 for C14 time series and Be10 time series for both the South and North Poles as well as Auroral historical time series. The results obtained from the wavelet transformation show that there are no periodicities of 80-88 yrs or 205 yrs. This suggests that these periodicities may be the result of applying transformations to time series that do not fulfill the condition of stationary. The estimated periodicities obtained the from Morlet wavelet are of 60 yrs (Yoshimura-Gleissberg cycle), 120 yrs and 240 yrs (Suess Cycle). The 120-periodicity could possibly be one of the principal periodicities of magnetic solar activity.
DE: 2104 Cosmic rays
DE: 2162 Solar cycle variations (7536)
DE: 7519 Flares
DE: 7536 Solar activity cycle (2162)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Joint Assembly