Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13c..07f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13C-07
Other
2104 Cosmic Rays, 2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes
Scientific paper
Voyager observations made during the past few years revealed that galactic cosmic ray (GCR) intensities near the termination shock are well below their interstellar values. Specifically, the heliosheath region accounts for about half of the total modulation of galactic cosmic ray protons with energies below 500 MeV. We study the process of GCR modulation in the heliosheath using a fully four-dimensional (3D space + momentum) cosmic-ray transport model. Our model is a product of a coupling between a 3D MHD-neutral plasma code and a new 4D Parker transport code. The model captures the essential physics of GCR transport, including drifts along the neutral sheet and the termination shock. The model incorporates essential 3D features, including the variability of the solar wind speed with heliolatitude and asymmetries of the termination shock and the heliosheath imposed by the tilt of the interstellar magnetic field. Simulations of the 2008 solar minimum modulation are presented and other solar-cycle modulation patterns are discussed.
Florinski Vladimir
Pogorelov Nikolai
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