The physics of cosmic ray modulation - Heliospheric propagation during the 1987 minimum

Details The physics of cosmic ray modulation - Heliospheric propagation during the 1987 minimum The physics of cosmic ray modulation - Heliospheric propagation during the 1987 minimum

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615877l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,877-15,898. Research supported by Compton Fund.

Physics

31

Current Sheets, Galactic Cosmic Rays, Heliosphere, Solar Cycles, Solar Magnetic Field, Interplanetary Magnetic Fields, Magnetic Field Configurations, Neutrons, Periodic Variations, Solar Wind Velocity

Scientific paper

Results are presented of observations of the period in and near the 1987 solar minimum of modulation. The investigation is based on measurements from neutron monitors and the IMP satellite at 1 AU and the Pioneer 10, Pioneer 11, Voyager 1, and Voyager 2 spacecraft distributed throughout the heliosphere to about 46 AU. A model is proposed for the onset of the new modulation cycle which includes a change in the average tilt angle of the current sheet as it propagates outward through the heliosphere at the solar wind velocity. It is inferred that transient phenomena (e.g., Forbush decreases and interaction regions) appear to dominate the higher levels of solar modulation following the 1987 period. A minimum is found in the amplitude of the 11-year variation of the radial gradient of integral cosmic ray intensity which propagates outward at the solar wind velocity. It is concluded that time dependence of the amplitude of the radial gradient is not the result of the inward-outward motion of a modulation boundary.

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