Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.6127p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 6127-6131. NASA-supported research.
Physics
25
Galactic Cosmic Rays, Heliosphere, Interplanetary Magnetic Fields, Magnetic Variations, Solar Cycles, Diffusion Coefficient, Elementary Particle Interactions, Fluctuation Theory, Transport Properties
Scientific paper
The authors have formally confirmed that galactic cosmic ray intensity variations measured by Voyager 2 during recovery from solar maximum are caused by traveling compressions and rarefactions in the mean interplanetary magnetic field. They used Voyager's magnetic field data as input to a time-independent, spherically symmetric, cosmic ray transport equation in the force field approximation. The solutions closely followed the count rate of cosmic rays greater than 75 MeV/nucleon over 4 years, during the recovery phase of the 11-year solar-driven cosmic ray cycle. This strongly supports prior theoretical assertions that turbulent interaction regions traveling with the solar wind are the major cause of the solar cycle variation of galactic cosmic rays in the ecliptic region.
Burlaga Leonard Francis
Perko John S.
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