Physics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.8735w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Aug. 1, 1988, p. 8735-8740.
Physics
81
Cosmic Rays, Current Sheets, Neutron Spectrometers, Solar Activity, Solar Cycles, Charged Particles, Correlation, Magnetic Rigidity
Scientific paper
Data on monthly average counting rate, collected from several neutron monitors from 1952 through the end of 1987, were examined. Several new features were found that demonstrate the existence of a 22-year modulation cycle for cosmic rays, in addition to the well known 11-year cycle. These features include a sharply peaked intensity maximum in 1987, at the time of the recent solar activity minimum, similar to that observed in 1965. As compared to the flatter maximum in the 1972-1977 period, the neutron monitor intensity at the time of the l987 and 1965 maxima was about 1.5 percent higher. Systematic differences in the overall shape of successive 11-year modulation cycles and similarities in the shape of alternate 11-year cycles are considered to be related to the 22-year magnetic cycle, and to agree with predictions of drift models with an equatorial current sheet. A high correlation was noted over the entire 1984-1987 period between the current sheet tilt angle and the neutron monitor intensity.
Lockwood John A.
Webber William R.
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