Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1174l&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A8, pp. SSH 5-1, CiteID 1174, DOI 10.1029/2001JA000186
Physics
2
Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Energetic Particles, Heliospheric (7514), Interplanetary Physics: Solar Cycle Variations (7536)
Scientific paper
We have determined the time variation of the rigidity dependence of the galactic cosmic ray modulation from 0.6 to 50 GV at the Earth during two complete 22-year solar cycles from 1960 to 2001. During three of the four cosmic ray intensity decrease periods the modulation can be described by the modulation function M = exp (KP-δ) with δ = 1.1 +/- 0.1 and K varying to account for the magnitude of the modulation. The intensity decrease period from 1987 to 1990 was different with δ = 0.8 +/- 0.1. The same modulation function M = exp (KP-δ), with δ = 1.15 +/- 0.10, also fitted the four intensity recovery phases of the two 22-year modulation cycles. Thus there was no change in the rigidity dependence of the 22-year cosmic ray modulation with the change in solar magnetic field polarity.
Debrunner Hermann
Lockwood John A.
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