Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.106...61m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 106, no. 1, Nov. 1984, p. 61-71.
Astronomy and Astrophysics
Astrophysics
23
Cosmic Ray Showers, Galactic Cosmic Rays, Interplanetary Medium, Solar Terrestrial Interactions, Solar Wind Velocity, Correlation Coefficients, Geomagnetism, Particle Flux Density, Secular Variations, Solar Corpuscular Radiation, Solar Flares, Sunspots, Time Lag
Scientific paper
The effect of variations in the interplanetary medium on the cosmic-ray intensity measured at the Inuvik neutron-monitoring station during solar cycle 20 (1964-1975) is investigated statistically on the basis of published observations. Parameters analyzed include the number of flares of importance 1 or greater per month, the relative sunspot number, the geomagnetic index, and the number of high-speed solar-wind streams (from the catalog of Lindblad and Lundstedt, 1981). The best cross-correlation coefficients and the corresponding time lags between the solar-activity event and the cosmic-ray intensity change are given as -0.88 and 2 mo for sunspot number, -0.76 and 4 mo for solar-flare number, -0.48 and 4 mo for proton events, -0.30 and 3 mo for streams, and -0.20 and 0 mo or +0.33 and 12 mo for geomagnetic index. A series of expressions defining an empirical model for the 11-year cycle is derived.
Mavromichalaki Helen
Petropoulos Basil
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