Enhanced interplanetary magnetic fields as the cause of Forbush decreases

Details Enhanced interplanetary magnetic fields as the cause of Forbush decreases Enhanced interplanetary magnetic fields as the cause of Forbush decreases

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....3.1082b&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 3. (A76-26851

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Cosmic Rays, Forbush Decreases, Interplanetary Magnetic Fields, Magnetic Field Configurations, Particle Intensity, Data Correlation, Drift Rate, Particle Energy, Particle Motion, Plasma-Particle Interactions, Solar Wind Velocity

Scientific paper

A strong correlation is observed between neutron monitor variations and variations in the interplanetary magnetic field intensity. It is thought that the cosmic ray intensity depressions are caused by perpendicular gradient drifts. The perpendicular gradient drift velocity for particles with energies exceeding 500 MeV in a magnetic field configuration produced by a representative stream is at least a few times the solar wind velocity. Thus particles can be swept away from the ecliptic by such a blob faster than the blob advances. It is suggested that this mechanism might be the cause of Forbush decreases and other cosmic ray variations near 1 AU.

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