Cosmic ray modulations related to the interplanetary magnetic field intensity

Details Cosmic ray modulations related to the interplanetary magnetic field intensity Cosmic ray modulations related to the interplanetary magnetic field intensity

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2973d&link_type=abstract

Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 2973-2981.

Physics

13

Cosmic Rays, Interplanetary Magnetic Fields, Modulation, Plasma-Particle Interactions, Relativistic Particles, Solar Cycles, Data Reduction, Galactic Radiation, Magnetic Disturbances, Particle Intensity, Transient Response

Scientific paper

A comprehensive investigation is undertaken of the nature of transient relativistic galactic cosmic ray modulations associated with interplanetary magnetic field intensity excursions in the vicinity of the earth, on the basis of an analysis of data covering the complete, 1965-1976 solar cycle. Following newly developed procedures for evaluating the statistical significance of the results obtained with this type of analysis, it is demonstrated that, while the days characterized by high IMF magnitude B are associated with intensity decreases, the low B IMF rarefactions cause an increase in the flux. In contrast to the case of geomagnetic disturbances, which occur more rapidly, the maximum cosmic ray intensity variations associated with both high and low B occur one day after the key days characterized by field departures from average values. This indicates that the modulation mechanism becomes efficient only when the earth's plasma engulfment extends at least 1 gyroradius beyond 1 AU.

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