New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods
The time variability of the cosmic ray (CR) intensity, recorded by the Climax neutron monitor and covering the period 1953–2004, has been analyzed by the joint application of the wavelet and the empirical mode decomposition (EMD) analyses. Dominant time scales of variability are found at ~11 yr, ~22...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/834247 |
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| author | A. Vecchio M. Laurenza M. Storini V. Carbone |
| author_facet | A. Vecchio M. Laurenza M. Storini V. Carbone |
| author_sort | A. Vecchio |
| collection | DOAJ |
| description | The time variability of the cosmic ray (CR) intensity, recorded by the Climax neutron monitor and covering the period 1953–2004, has been analyzed by the joint application of the wavelet and the empirical mode decomposition (EMD) analyses. Dominant time scales of variability are found at ~11 yr, ~22 yr, ~6 yr and in the range of the quasi-biennial oscillations (QBOs). The combination of the 11 yr cycle and QBOs explains the Gnevychev Gap (GG) phenomenon and many step-like decreases characterizing the CR modulation. The additional scales of variability at ~22 yr and ~6 yr are responsible for other features of the long-term CR trend, such as the intensity flat-topped profile, following the maxima of even-numbered cycles during positive polarity state of the heliosphere (). Comparison with basic time scales of variability derived from the sunspot area (SA) allows the association of the 11 yr cycle and QBOs with solar activity variations, whereas the other two modes with the drift effects govern the CR entrance in
the heliosphere. |
| format | Article |
| id | doaj-art-1bcbc90c63bf46debb146d9e90bcd4a5 |
| institution | OA Journals |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-1bcbc90c63bf46debb146d9e90bcd4a52025-08-20T02:01:50ZengWileyAdvances in Astronomy1687-79691687-79772012-01-01201210.1155/2012/834247834247New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing MethodsA. Vecchio0M. Laurenza1M. Storini2V. Carbone3Dipartimento di Fisica, Università della Calabria, 87036 Rende (CS), ItalyIAPS, INAF, Via del Fosso del Cavaliere 100, 00133 Roma, ItalyIAPS, INAF, Via del Fosso del Cavaliere 100, 00133 Roma, ItalyDipartimento di Fisica, Università della Calabria, 87036 Rende (CS), ItalyThe time variability of the cosmic ray (CR) intensity, recorded by the Climax neutron monitor and covering the period 1953–2004, has been analyzed by the joint application of the wavelet and the empirical mode decomposition (EMD) analyses. Dominant time scales of variability are found at ~11 yr, ~22 yr, ~6 yr and in the range of the quasi-biennial oscillations (QBOs). The combination of the 11 yr cycle and QBOs explains the Gnevychev Gap (GG) phenomenon and many step-like decreases characterizing the CR modulation. The additional scales of variability at ~22 yr and ~6 yr are responsible for other features of the long-term CR trend, such as the intensity flat-topped profile, following the maxima of even-numbered cycles during positive polarity state of the heliosphere (). Comparison with basic time scales of variability derived from the sunspot area (SA) allows the association of the 11 yr cycle and QBOs with solar activity variations, whereas the other two modes with the drift effects govern the CR entrance in the heliosphere.http://dx.doi.org/10.1155/2012/834247 |
| spellingShingle | A. Vecchio M. Laurenza M. Storini V. Carbone New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods Advances in Astronomy |
| title | New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods |
| title_full | New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods |
| title_fullStr | New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods |
| title_full_unstemmed | New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods |
| title_short | New Insights on Cosmic Ray Modulation through a Joint Use of Nonstationary Data-Processing Methods |
| title_sort | new insights on cosmic ray modulation through a joint use of nonstationary data processing methods |
| url | http://dx.doi.org/10.1155/2012/834247 |
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