Observations of the dynamics of the cosmic ray modulation

Details Observations of the dynamics of the cosmic ray modulation Observations of the dynamics of the cosmic ray modulation

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89...17l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 17-25.

Physics

40

Forbush Decreases, Galactic Cosmic Rays, Modulation, Particle Flux Density, Annual Variations, Satellite Observation, Shock Wave Propagation, Solar Cosmic Rays, Solar Cycles

Scientific paper

New measurements of the outward propagation of the cosmic ray modulation and large transient decreases at a radial distance of 10-30 AU from the earth are reported. Also, new observations of the hysteresis effect in the 11-year modulation are presented for two solar cycles, and an attempt is made to reproduce the long-term modulation at earth from the observed transient or Forbush decreases. The results indicate that steady-state, spherically symmetric models of the heliosphere are not capable of explaining the 11-year variation. A time-dependent solution to the cosmic ray transport equation is required to describe the solar cosmic ray modulation.

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