Odd and even cycles in cosmic rays and solar activity

Details Odd and even cycles in cosmic rays and solar activity Odd and even cycles in cosmic rays and solar activity

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3791u&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

We present here a new method to define the evolution of cosmic ray and solar activity cycles using the time delayed component method in a 2D phase space. This method is free from the ambiguousness related to the exact timing of cosmic ray maxima and minima. We study the relationship between solar activity and cosmic ray intensity for the last four 11-year cycles. We confirm that the evolution of cosmic ray intensity is different for odd and even cycles and show that odd cosmic ray cycles are longer and have longer autocorrelation lengths than even cycles. The momentary time lag between cosmic ray intensity and sunspot activity is about one year for odd cycles and small or negative for even cycles. This reflects the difference in the cosmic ray modulation conditions for odd and even cycles and is probably associated with the influence of drift effects.

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