Abstract The combination of gradient, curvature and heliospheric neutral sheet (HNS) drifts with interaction regions (IRs) 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”, α, of the wavy neutral sheet this happens when α ≤ (35 ± 5)°. 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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    Title :

    Time-dependent cosmic-ray modulation: Role of drifts and interaction regions


    Contributors:

    Published in:

    Advances in Space Research ; 13 , 6 ; 239-249


    Publication date :

    1993-01-01


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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