Other
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611587l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,587-11,604.
Other
26
Forbush Decreases, Interplanetary Magnetic Fields, Magnetic Clouds, Cosmic Rays, Neutron Counters
Scientific paper
The temporal association of magnetic clouds and Forbush decreases has been examined, and practically no association of the main phase of the Forbush decrease with the arrival of a magnetic cloud is found. On the other hand, Forbush decreases generally follow the strong interplanetary shocks which sometimes precede magnetic clouds. The main phase of the cosmic ray decrease occurs 2-5 hours after the shock and during the passage of the region in which the magnetic field is disturbed. It appears that a Forbush decrease is more likely to occur following a shock in which the magnetic field and plasma parameters are strongly enhanced. These results indicate that the decrease of the cosmic ray intensity may be produced by the smaller diffusion coefficient in the region behind the shock.
Debrunner Hermann
Lockwood John A.
Webber William R.
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