A perturbation approach to cosmic ray transients in interplanetary space

Details A perturbation approach to cosmic ray transients in interplanetary space A perturbation approach to cosmic ray transients in interplanetary space

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.2903c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 2903-2913.

Physics

53

Forbush Decreases, Galactic Cosmic Rays, Interplanetary Space, Perturbation Theory, Solar Cycles, Diffusion Coefficient, Hysteresis, Modulation, Solar Wind Velocity, Sunspot Cycle, Time Dependence

Scientific paper

A perturbation approach is used to model the linear response of the cosmic ray distribution as a function of perturbations in the solar wind transport parameters. The analytical technique permits examination of the effects of the different solar wind parameters, i.e., velocity, drift velocity and the diffusion tensor, which are additive. Cosmic ray changes in the solar wind are neglected. Variations in the diffusion coefficient and the convection-diffusion equation are applied to describing Forbush decreases and the 11-yr solar cycle variations. The treatment is limited to energies above 100 MeV, yet is considered valid enough to have identified a hysteresis effect in the 11-yr variation, wherein high-energy particles lead low-energy particles to a magnitude that increases with increasing heliocentric distance within the inner heliosphere. The calculations also indicate that the Forbush decreases are a cumulative effect of precipitous precursors accompanied by slow recoveries from travelling solar wind perturbations.

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