Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11012108u&link_type=abstract
Journal of Geophysical Research, Volume 110, Issue A12, CiteID A12108
Physics
86
Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Solar Cycle Variations (7536), Interplanetary Physics: Interplanetary Magnetic Fields, Space Weather: Space Radiation Environment, Global Change: Solar Variability (7537)
Scientific paper
The differential energy spectrum of galactic cosmic rays in the vicinity of the Earth can be parameterized by the so-called force field model which has only one parameter, the modulation potential $\phi$, for a given local interstellar spectrum. Here we present the series of monthly values of the modulation potential $\phi$ since February 1951, reconstructed using the data from the worldwide neutron monitor network and calibrated with precise balloon and space-borne direct measurements of cosmic ray energy spectrum. This work provides a long series of a parameter allowing for a quantitative estimate of the average monthly differential energy spectrum of cosmic rays near the Earth. A comparison with other occasional direct measurements of cosmic ray spectra confirms the reliability of the present reconstruction. The results can be applied in studies of long-term solar-terrestrial relations and the global evolution of the heliosphere.
Alanko-Huotari Katja
Kovaltsov Gennady A.
Mursula Kalevi
Usoskin Ilya G.
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