Physics
Scientific paper
Apr 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960natur.186..299e&link_type=abstract
Nature, Volume 186, Issue 4721, pp. 299-300 (1960).
Physics
3
Scientific paper
THE primary cosmic ray intensity at the Earth shows characteristic variations in time which are related to solar and geomagnetic activity. This relationship exists partly because of the modulation of the galactic cosmic ray flux by interplanetary magnetic and electric fields and partly because of the acceleration of particles to cosmic ray energies on or near the Sun. The eleven-year variation, the sharp drop in intensity associated with great magnetic storms, the quasi-periodic 27-day variation and the solar daily variation appear to belong to the former category. The occasional very large, and more frequent small increases in intensity, associated with solar flares are due to local production of high-energy particles. Detailed study of these variations in intensity has led to the development of several alternative models of the interplanetary magnetic field.
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