On the New Index of the Long-Period Modulation of the Galactic Cosmic Rays Intensity

Details On the New Index of the Long-Period Modulation of the Galactic Cosmic Rays Intensity On the New Index of the Long-Period Modulation of the Galactic Cosmic Rays Intensity

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acppb..39.2961a&link_type=abstract

Acta Physica Polonica B, vol. 39, Issue 11, p.2961

Physics

3

Scientific paper

Data of neutron monitors have been used to calculate the temporal changes of the power law rigidity spectrum of the long period variations of the galactic cosmic ray (GCR) intensity for two positive (A>0) and two negative (A<0) polarity epochs of solar magnetic cycles (1960-2002). A relationship between the temporal changes of the rigidity spectrum of the long period variations of the GCR intensity and the power spectral density (PSD) of the interplanetary magnetic field (IMF) turbulence has been found. The soft rigidity spectrum of the long period variations of the GCR intensity for the maximum epochs and the hard spectrum for the minimum epochs should be caused by different structure of the IMF turbulence in the range of the frequencies 10-6-10-5 Hz during the 11-year cycle of solar activity. A noticeable distinction between the temporal changes of the rigidity spectrum for the A>0 and the A<0 polarity epoch is not found. The temporal changes of the exponent of the rigidity spectrum of the long period variations of the GCR intensity should be considered as one of the important (new) indexes to study the 11-year variations of GCR intensity. The new index can be used to determine an exponent of PSD in the energy range 10-6-10-5 Hz of the IMF turbulence. That region of the IMF turbulence is responsible for the scattering of the GCR particles of 5-50 GV rigidity to which neutron monitors are sensitive.

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