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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Cosmic ray modulation beyond the heliopause: A hybrid modeling approach
Astrophysical Journal Letters, Volume 765, No. 1, Article L18, Year 2013
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Description
Results from a newly developed hybrid cosmic ray (CR) modulation model are presented. In this approach, the transport of CRs is computed by incorporating the plasma flow from a magnetohydrodynamic model for the heliospheric environment, resulting in representative CR transport. The model is applied to the modulation of CRs beyond the heliopause (HP) and we show that (1) CR modulation persists beyond the HP, so it is unlikely that the Voyager spacecraft will measure the pristine local interstellar spectra of galactic CRs when crossing the HP. (2) CR modulation in the outer heliosheath could maintain solar-cycle-related changes. (3) The modulation of CRs in the outer heliosheath is primarily determined by the ratio of perpendicular to parallel diffusion, so that the value of the individual diffusion coefficients cannot be determined uniquely using this approach. (4) CRs can efficiently diffuse between the nose and tail regions of the heliosphere. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Strauss, R. D.
South Africa, Potchefstroom
North-west University
Potgieter, Marius S.
South Africa, Potchefstroom
North-west University
Ferreira, Stefan E.S.
South Africa, Potchefstroom
North-west University
Fichtner, Horst
Germany, Bochum
Ruhr-universitat Bochum
Scherer, Klaus
Germany, Bochum
Ruhr-universitat Bochum
Statistics
Citations: 59
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1088/2041-8205/765/1/L18
ISSN:
20418205
e-ISSN:
20418213