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| Titel |
Evidence for cosmic ray modulation in temperature records from the South Atlantic Magnetic Anomaly region |
| VerfasserIn |
E. Frigo, I. G. Pacca, A. J. Pereira-Filho, P. H. Rampelloto, N. R. Rigozo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 10 ; Nr. 31, no. 10 (2013-10-29), S.1833-1841 |
| Datensatznummer |
250086133
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1833-2013.pdf |
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| Zusammenfassung |
| Possible direct or indirect climatic effects related to solar variability
and El Niño–Southern Oscillation (ENSO) were investigated in the
southern Brazil region by means of the annual mean temperatures from four
weather stations 2 degrees of latitude apart over the South Atlantic
Magnetic Anomaly (SAMA) region. Four maximum temperature peaks are evident
at all stations in 1940, 1958, 1977 and 2002. A spectral analysis indicates
the occurrence of periodicities between 2 and 7 yr, most likely
associated with ENSO, and periodicities of approximately 11 and 22 yr,
normally associated with solar variability. Cross-wavelet analysis indicated
that the signal associated with the 22 yr solar magnetic cycle was more
persistent in the last decades, while the 11 yr sunspot cycle and ENSO
periodicities were intermittent. Phase-angle analysis revealed that
temperature variations and the 22 yr solar cycle were in anti-phase near
the SAMA center. Results show an indirect indication of possible
relationships between the variability of galactic cosmic rays and climate
change on a regional scale. |
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