期刊
ASTROPHYSICAL JOURNAL
卷 808, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/808/1/82
关键词
cosmic rays; magnetohydrodynamics (MHD); Sun: heliosphere
资金
- National Basic Research Program (973 program) [2012CB825601]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KZZD-EW-01-4]
- National Natural Science Foundation of China [41231068, 41031066, 41074121, 41274192, 41074122, 41304137]
- Specialized Research Fund for State Key Laboratories
- North-West University in South Africa
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- South African NRF [87820, 68198]
- NASA [NNX12AB30G, NNX14AJ53G, NNX14AF41G, SMD-11-2195]
- NSF PRAC award [OCI-1144120]
- NSF XSEDE project [MCA07S033]
- International Space Science Institute in Bern, Switzerland
- National Science Foundation [CNS 09-23050]
- Office of Advanced Cyberinfrastructure (OAC)
- Direct For Computer & Info Scie & Enginr [1144120] Funding Source: National Science Foundation
Based on a hybrid galactic cosmic-ray transport model, which incorporated MHD global heliospheric data into Parker's cosmic-ray transport equation, we studied the behavior of the transport of galactic cosmic rays and the corresponding gradients in their flux near the heliopause (HP). We found that, (1) by increasing the ratio of the parallel diffusion coefficient to the perpendicular diffusion coefficient in the interstellar magnetic field of the outer heliosheath, the simulated radial flux near the HP increases as well. As the ratio multiplying factor reached 1010, the radial flux experienced a sudden jump near the HP, similar to what Voyager 1 observed in 2012. (2) The effect of changing the diffusion coefficients' ratio on the radial flux variation depends on the energy of the cosmic rays, the lower the energy, the more pronounced the effect is. (3) The magnitude of the diffusion coefficients also affect the radial flux near the HP, the modulation beyond the HP varies by adjusting the magnitude multiplying factor.
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