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ICN-UNAM
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icrc2007@icrc2007.unam.mx
30th International Cosmic Ray Conference
The 30th International Cosmic Ray Conference will be held from July 3, 2007 to July 11, 2007 in Merida, Yucatan, Mexico.
True
Merida, Mexico
2007-07-03T08:00:00
2007-07-11T19:00:00
2005-09-26T05:04:53
2024-04-12T17:46:55
Mexico/General
Dr.
IGeof-UNAM
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false
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201 (10B)
1
Poster
The 120-yrs solar cycle of the cosmogenic isotopes
Dr.
Universidad Nacional Autonoma de Mexico, Instituto de Geofisica
e850c8550923689365acf95418ce657e
Dr.
Universidad Nacional Autonoma de Mexico, Instituto de Geofisica
e850c8550923689365acf95418ce657e
Dr.
Universidad Nacional Autonoma de Mexico, Instituto de Geofisica
40af9343b8bb9d18708b4f0252d5f53c
Dr.
Universidad Nacional Autonoma de Mexico, Instituto de Geofisica
9bdab64740f6219c1663c2f525a4a7ef
Merida, Mexico
Regency (Hyatt)
2007-07-09T14:45:00
2007-07-09T14:45:00
The solar periodicities of 80-88 yrs (Gleissberg cycle) and 205 yrs (de Vries cycle or Suess cycle) using different
time series of proxies of cosmogenic isotopes 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. 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 (de Vries cycle or Suess Cycle). The 120-periodicity could possibly be one of the principal periodicities
of magnetic solar activity.
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More information about the venue
http://www.icrc2007.unam.mx/
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