Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...592..574c&link_type=abstract
The Astrophysical Journal, Volume 592, Issue 1, pp. 574-579.
Astronomy and Astrophysics
Astronomy
8
Cosmic Rays, Solar Wind, Sun: Coronal Mass Ejections (Cmes)
Scientific paper
Using a recent classification of the solar wind at 1 AU into its principal components (slow solar wind, high-speed streams, and coronal mass ejections [CMEs]) for 1972-2000, we show that the monthly averaged Galactic cosmic-ray intensity is anticorrelated with the percentage of time that the Earth is embedded in CME flows. We suggest that this anticorrelation results primarily from a CME-related change in the tail of the distribution function of hourly averaged values of the solar wind magnetic field (B) between solar minimum and solar maximum. The number of high B-values (>=10 nT) increases by a factor of ~3 from minimum to maximum (from 5% of all hours to 17%), with about two-thirds of this increase due to CMEs. On an hour-to-hour basis, average changes of cosmic-ray intensity at Earth become negative for solar wind magnetic field values >=10 nT.
Cliver Edward W.
Ling A. G.
Richardson Ian G.
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