Computer Science
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..239p&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 239-249.
Computer Science
26
Cosmic Rays, Elementary Particle Interactions, Heliosphere, Neutral Sheets, Plasma Drift, Transport Theory, Particle Acceleration, Time Dependence, Two Dimensional Models
Scientific paper
The combination of gradient, curvature and heliospheric neutral sheet drifts with interaction regions occurring in the inner heliosphere and merged interaction regions (MIRs) in the outer heliosphere would enable one to successfully simulate complete 11- and 22-yr cycles with comprehensive, global modulation models. This is possible because both drifts and MIRs happen on a large scale. With this scenario, drifts are primarily responsible for long-term modulation during low to moderate solar activity for both magnetic cycles. In terms of the 'tilt angle', alpha, of the wavy neutral sheet this happens when alpha = (35 +/- 5) deg or less. With moderate to high solar activity MIRs become progressively more important, but still in combination with drifts, to eventually dominate during maximum solar activity when global drift effects cannot occur any longer. The rate at which solar activity decreases (increases) before (after) minimum modulation will then become crucial in determining when and what process begins to dominate.
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