The time variability of the Rome neutron monitor data (SVIRCO Observatory: INAF/IFSI-Roma and UNIRomaTre collaboration; rigidity threshold about 6.3 GV) from 1964 to 2004 was analyzed by using the Empirical Mode Decomposition (EMD) technique. Two prominent scales of variability have been identified: the ∼ 11-yr (Schwabe) cycle and the quasi biennial oscillations (QBOs). It is shown that the superposition of the two waves reproduces fairly well the long-term trend of the SVIRCO data. Moreover, the QBO role in producing the Gnevyshev Gap is discussed. A significant correlation has also been found between QBOs of the heliomagnetic field and cosmic ray intensity only during even solar activity cycles, with possible implications for cosmic ray modulation.

Time variability of the Rome cosmic ray intensity

CARBONE, Vincenzo
2011-01-01

Abstract

The time variability of the Rome neutron monitor data (SVIRCO Observatory: INAF/IFSI-Roma and UNIRomaTre collaboration; rigidity threshold about 6.3 GV) from 1964 to 2004 was analyzed by using the Empirical Mode Decomposition (EMD) technique. Two prominent scales of variability have been identified: the ∼ 11-yr (Schwabe) cycle and the quasi biennial oscillations (QBOs). It is shown that the superposition of the two waves reproduces fairly well the long-term trend of the SVIRCO data. Moreover, the QBO role in producing the Gnevyshev Gap is discussed. A significant correlation has also been found between QBOs of the heliomagnetic field and cosmic ray intensity only during even solar activity cycles, with possible implications for cosmic ray modulation.
2011
Cosmic rays; Data analysis; Interplanetary magnetic field
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/164899
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact