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Detailed Reference Information
Forman et al. 1986
Forman, M.A., Jones, F.C. and Perko, J.S. (1986). Phase propagation of the solar modulation of galactic cosmic rays. Journal of Geophysical Research 91: doi: 10.1029/JA091iA03p02914. issn: 0148-0227.

The phase of the 11-year galactic cosmic ray variation, due to a varying rate of emission of long-lived, propagating regions of enhanced scattering, travels faster than the scattering regions themselves. The radial speed of the 11-year phase in the quasi-steady force field approximation is exactly twice the speed of the individual episodic decreases. A time-dependent numerical solution for 1-GeV protons at 1 and 30 AU gives a phase speed which is 1.85 times the propagation speed of the individual decreases.

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Journal of Geophysical Research
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