Short-term variations of the galactic cosmic ray intensity - 1964-1967

Details Short-term variations of the galactic cosmic ray intensity - 1964-1967 Short-term variations of the galactic cosmic ray intensity - 1964-1967

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..681p&link_type=abstract

Planetary and Space Science, vol. 25, July 1977, p. 681-687.

Physics

Cosmic Rays, Galactic Radiation, Interplanetary Medium, Solar Atmosphere, Solar Wind, Chromosphere, Faculae, Photosphere, Shock Wave Propagation, Solar Activity Effects, Statistical Analysis, Twenty-Seven Day Variation

Scientific paper

A statistical analysis of time variations in ground-level nucleonic cosmic-ray intensity for the interval from 1964 to 1967 is presented which incorporates synoptic observations of the solar white-light corona as well as indices of photospheric and chromospheric activity. Correlation analysis of solar activity and short-term modulation reveals that all indices vary significantly on time scales near the solar rotation period and that the correlation function exhibits a quasi-sinusoidal variation that maximizes near zero lag. It is found that 27-day variations of the indices were most pronounced in 1966-1967, that recurrent cosmic-ray depressions occurred in conjunction with observed solar-wind disturbances, and that two categories of interplanetary disturbance are sufficient to account for the large recurrent cosmic-ray depressions in 1966-1967. It is suggested that flare-generated shocks were the main source of these recurrent cosmic-ray variations and that the contribution of corotating cosmic-ray disturbances to the observed recurrent modulation was probably very small. This hypothesis is tested against the correlation functions of solar and cosmic-ray indices.

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