An update on the correlation between the cosmic radiation intensity and the geomagnetic AA index

Details An update on the correlation between the cosmic radiation intensity and the geomagnetic AA index An update on the correlation between the cosmic radiation intensity and the geomagnetic AA index

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....4..501s&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 4 p 501-504 (SEE N85-34729 23-92)

Physics

Correlation, Ecliptic, Galactic Cosmic Rays, Geomagnetism, Heliosphere, Interplanetary Magnetic Fields, Magnetic Field Inversions, Modulation, Neutron Counters, Solar Cycles, Solar Magnetic Field, Solar Wind, Sunspot Cycle, Cosmic Ray Showers, Least Squares Method, Time Dependence

Scientific paper

A statistical study between the cosmic ray intensity, as observed by a neutron monitor, and of the geomagnetic aa index, as representative of perturbations in the plasma and interplanetary magnetic field in the heliosphere, has been updated to specifically exclude time periods around the reversal of the solar magnetic field. The results of this study show a strong negative correlation for the period 1960 through 1968 with a correlation coefficient of approximately -0.86. However, there is essentially no correlation between the cosmic ray intensity and the aa index for the period 1972-1979 (i.e. correlation coefficient less than 0.16). These results would appear to support the theory of preferential particle propagation into the heliosphere vis the ecliptic during the period 1960-1968 and via the solar polar regions during 1972-1979.

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