Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ncimc..10..387m&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 10 C, July-Aug. 1987, p. 387-395.
Other
Annual Variations, Cosmic Rays, Radiant Flux Density, Solar Activity Effects, Harmonic Analysis, Neutron Counters, Power Spectra, Spectrum Analysis
Scientific paper
Data from four neutron monitors, Climax (1953-1976), Deep River (1964-1977), Mt. Norikura (1957-1983) and Tokyo (1970-1983) are analyzed. Power spectra reveal peaks at frequency lc/16 months for all the stations. Harmonic analysis for the 16-month period is performed after eliminating the long-term solar-cycle variation. There is general agreement in the phases of the mean vectors for various neutron monitors. The amplitude averaged over all the four stations is 0.41 + or - 0.01, while it is higher for the two stations having lower cut-off rigidity as compared to that of the other two. The vectors are seen to become more consistent in phase for periods of minimum solar activity than those for maximum-activity period. The summation dials reveal abrupt changes in the directions of the 16-month wave vector corresponding to the reversal of polarity of the solar magnetic field. Comparison of the 16-month wave of sunspot activity with that of cosmic-ray intensity, however, does not show any significant correlation.
Ganguly S. R.
Mitra Bivas
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