The Time-Dependent Transport of Cosmic Rays in the Heliosphere

Details The Time-Dependent Transport of Cosmic Rays in the Heliosphere The Time-Dependent Transport of Cosmic Rays in the Heliosphere

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.230..393p&link_type=abstract

Astrophysics and Space Science, Volume 230, Issue 1-2, pp. 393-403

Astronomy and Astrophysics

Astrophysics

6

Cosmic Rays: Heliosphere, Sun: Activity Cycle

Scientific paper

The modulation of cosmic rays (CRs) in the heliosphere is a dynamic and therefore a highly time-dependent process. Numerical models with only a time-dependent neutral sheet prove to be successful when moderate to low solar activity occurs but fail to describe large and discrete steps in modulated CRs when solar activity is high. To explain this feature of heliospheric modulation, the concept of global merged interaction regions (GMIRs) is required. The combination of gradient, curvature and neutral sheet drifts with these GMIRs has so far been the most successful approach in explaining the 11-year and 22-year cycles in the long-term modulation of CRs.

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