Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..74..303x&link_type=abstract
Astrophysics and Space Science, vol. 74, no. 2, Feb. 1981, p. 303-317.
Astronomy and Astrophysics
Astrophysics
15
Cosmic Rays, Geomagnetism, Magnetic Variations, Particle Flux Density, Solar Activity Effects, Solar Cycles, Annual Variations, Indexes (Ratios), Interplanetary Space, Solar Protons, Solar Wind, Sunspot Cycle, Sunspots
Scientific paper
The existence of an 11-year modulation of cosmic-ray intensity in the 20th solar cycle is found using data from nine neutron monitoring stations over the period 1965-1975. A fundamental equation which describes the long-term modulation of cosmic-ray intensity is obtained. According to this relation, the modulated intensity measured by the ground stations is equal to the galactic cosmic-ray intensity (unmodulated) at a finite distance (corrected by a few appropriate solar and terrestrial activity indices) which causes disturbances in interplanetary space. The relation is explained by a generalization of the Simpson solar wind model (1963).
Mavromichalaki Helen
Petropoulos Basil
Xanthakis John
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