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| Titel |
Low- and high-frequency spectral behavior of cosmic-ray intensity for the period 1953–1996 |
| VerfasserIn |
H. Mavromichalaki, P. Preka-Papadema, B. Petropoulos, I. Tsagouri, S. Georgakopoulos, J. Polygiannakis |
| 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 ; 21, no. 8 ; Nr. 21, no. 8, S.1681-1689 |
| Datensatznummer |
250014671
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| Publikation (Nr.) |
 copernicus.org/angeo-21-1681-2003.pdf |
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| Zusammenfassung |
A study of the cosmic-ray
intensity power spectrum using the Climax Neutron Monitor data in the frequency
range from 10-9 Hz to 10-7 Hz (which corresponds to
periodicities from 11 years to a few months) during the period 1953–1996, was
carried out by means of the successive approximations method of analysis and
was compared against the power spectrum and the maximum entropy methods. The
contributions of the time evolution of several peaks to the global one were
obtained. Except for the well-known 11-year and the 1-year variations, peaks at
7.7, 5.5, 2 and 1.7 years are found. Several peaks with periods less than 10
months have appeared in our analysis, while the occurrence of 5.1 months is
obtained in all the examined solar cycles with a strong signature in cycle 21.
Transitions of these quasi-periodicities are seen in power spectra plots. Some
of them can be attributed to the modulation of the cosmic ray intensity by
solar activity. Others are sporadic and have been previously attributed to the
interplanetary magnetic field. The results obtained support once again the
argument regarding the difference in the solar activity between odd and even
solar cycles.
Key words. Interplanetary physics
(Cosmic rays, Interplanetary magnetic fields) |
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