Study and effect of magnetic clouds on the transient modulation of cosmic-ray intensity

Details Study and effect of magnetic clouds on the transient modulation of cosmic-ray intensity Study and effect of magnetic clouds on the transient modulation of cosmic-ray intensity

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..134..203b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 134, July 1991, p. 203-209.

Physics

18

Magnetic Clouds, Radiant Flux Density, Solar Cosmic Rays, Interplanetary Magnetic Fields, Interplanetary Space, Shock Fronts, Space Plasmas

Scientific paper

Data of cosmic-ray intensity from the Calgary Super Neutron Monitor and interplanetary plasma and field data are derived into three groups corresponding to the magnetic clouds preceded by shocks, followed by interaction region and clouds without any such association, observed during the period 1967-1982. A superposed epoch analysis of these data, in addition to the field variance data, have been performed. The results suggest the hypothesis that the Forbush decreases are caused by the scattering of particles in the region of enhanced turbulence, observed during the passage of shocked plasma (i.e., sheath) between the shock front and the magnetic cloud.

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