Galactic Cosmic Rays in the Outer Heliosphere

Details Galactic Cosmic Rays in the Outer Heliosphere Galactic Cosmic Rays in the Outer Heliosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51b1677f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51B-1677

Physics

[2104] Interplanetary Physics / Cosmic Rays, [2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2134] Interplanetary Physics / Interplanetary Magnetic Fields

Scientific paper

We report a next generation model of galactic cosmic ray (GCR) transport in the three dimensional heliosphere. Our model is based on an accurate three-dimensional representation of the heliospheric interface. This representation is obtained by taking into account the interaction between partially ionized, magnetized plasma flows of the solar wind and the local interstellar medium. Our model reveal that after entering the heliosphere GCRs are stored in the heliosheath for several years. The preferred GCR entry locations are near the nose of the heliopause and at high latitudes. Low-energy (hundreds of MeV) galactic ions observed in the heliosheath have spent, on average, a longer time in the solar wind than those observed in the inner heliosphere, which would explain their cooled-off spectra at these energies. We also discuss radial gradients in the heliosheath and the implications for future Voyager observations. GCR storage times in different regions of the heliosphere: solar wind (red), heliosheath (green) and heliotail (blue) for an observer at 30 AU (left) and at 100 AU (right).

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