Physics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10224221l&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue A11, p. 24221-24228
Physics
11
Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Energetic Particles, Heliospheric, Interplanetary Physics: Pickup Ions, Interplanetary Physics: Solar Cycle Variations
Scientific paper
The cosmic ray proton and helium intensities measured on the IMP spacecraft near the Earth from ~45MeV to several hundred MeV in April 1996 indicate that the intensities have recovered to almost the same maximum values they had at the last sunspot minimum. The 1996 intensities near the Earth are an even closer match to those observed two 11-year cycles earlier in 1976. This confirming evidence of a 22-year periodicity in the low-energy cosmic ray intensities and spectral shapes is attributed to the effects of the difference in the entry of cosmic rays into the heliosphere as well as their different drift motion inside the heliosphere as a consequence of the 22-year periodicity in the solar magnetic field. This observation thus suggests that drifts play a significant role in the cosmic ray modulation process.
Lockwood John A.
Webber William R.
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