On Mid-Term Periodicities in Cosmic Rays |
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Authors: | Karel Kudela Helen Mavromichalaki Athanasios Papaioannou Maria Gerontidou |
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Institution: | (1) Division of Cardiology, Rabin Medical Center, 49100 Petah Tiqwa, Israel;(2) Sackler Faculty of Medicine, Tel Aviv University, Beilinson Campus, Petah Tiqwa, Israel;(3) Shamakhy Astrophysical Observatory named after N. Tusi and Laboratory of Heliobiology, Azerbaijan National Academy of Sciences, Baku, the Republic of Azerbaijan;(4) Institute of Physics, Azerbaijan National Academy of Sciences, Baku, the Republic of Azerbaijan;(5) Epidemiology and Informatics Unit, Rabin Medical Center, Petah Tiqwa, Israel;(6) Department of Geophysics and Planetary Sciences, Tel Aviv University, Tel Aviv, Israel |
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Abstract: | The contributions of quasi-periodic variations of cosmic rays for T>27 days at the primary energies to which neutron monitors are sensitive have a rather complicated character. They were reported
in several papers (e.g. Valdés-Galicia, Perez-Enriquez, and Otaola, 1996; Mavromichalaki et al., 2003; Kudela et al., 2002; Caballero and Valdés-Galicia, 2001) from individual stations and for various time intervals covered. The data archive of several neutron monitor stations developed
within the NMDB project () now involves long time series of measurements at neutron monitors situated at different geomagnetic cut-off rigidity positions
and at different altitudes. It is updated continuously. Using the daily averages of cosmic-ray intensity at three selected
stations within NMDB: i) the temporal evolution of the selected quasi-periodicities, especially those of approximately 1.7 yr, 150 days and 26 – 32 days
respectively, until 2008 are reviewed, ii) the similarities of the spectra are checked and iii) the occurrence of quasi-periodicities with those observed in solar, interplanetary and geomagnetic activities (Moussas et al., 2005; Richardson and Cane, 2005) as well as in energetic particles below the atmospheric threshold are discussed (Laurenza et al., 2009). |
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