The low-frequency spectral behavior of cosmic ray intensity

Details The low-frequency spectral behavior of cosmic ray intensity The low-frequency spectral behavior of cosmic ray intensity

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615871k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,871-15,875.

Physics

16

Cosmic Rays, Low Frequencies, Power Spectra, Solar Activity Effects, Spectrum Analysis, Heliosphere, Interplanetary Magnetic Fields, Neutron Counters, Sunspot Cycle, Twenty-Seven Day Variation

Scientific paper

The time series of cosmic ray intensity over a very wide range of frequencies is analyzed using daily and monthly mean neutron monitor intensity data. The behavior of spectral characteristics in different ranges of periodicities covering days to several years is studied. An abrupt change is found in both the level and shape of the power spectrum at about 20 months, indicating that the cosmic-ray time variations with periods longer than 20 months are caused by a different physical mechanism than that of the short-period variations. The spectral density for periodicities smaller than 27 days shows a systematic variation with solar cycle activity reaching a minimum level corresponding to solar activity minima. This indicates a 22-year cycle dependence corresponding to the different polarity of the solar magnetic fields.

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