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Effects of Anomalous Cosmic Rays on the Structure of the Outer Heliosphere
Guo, Xiaocheng; Florinski, Vladimir; Wang, Chi; Guo, XC (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Guo, XC (reprint author), Univ Chinese Acad Sci, Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume859Issue:2Pages:157
ISSN0004-637X
Language英语
KeywordCosmic Rays Diffusion Magnetohydrodynamics (Mhd) Methods: Numerical Plasmas Sun: Heliosphere
AbstractBased on Voyager 1 observations, some anomalous cosmic rays (ACRs) may have crossed the heliopause and escaped into the interstellar medium, providing a mechanism of energy transfer between the inner and outer heliosheaths that is not included in conventional magnetohydrodynamics (MHD) models. In this paper, we study the effect of energetic particles' escape through the heliopause on the size and shape of the heliosphere using a simple model that includes diffusive transport of cosmic rays. We show that the presence of ACRs significantly changes the heliosphere structure, including the location of the heliopause and termination shock. It was found that the heliopause would contract for certain values of the ACR diffusion coefficients when the diffusive particles' pressure is comparable to the pressure of the plasma background. The difference in Voyager 1 and 2 observations of energetic particles during their respective termination shock crossings is interpreted here as due to the differences in diffusion environments during the different phases of the solar cycle. The shorter period of enhanced ACR intensities upstream of the shock measured by Voyager 2 may have been caused by weaker radial diffusive transport compared with the time of Voyager 1 crossing. We conclude that ACR diffusive effects could be prominent and should be included in MHD models of the heliosphere.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6324
Collection空间科学部
Corresponding AuthorGuo, XC (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Guo, XC (reprint author), Univ Chinese Acad Sci, Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Guo, Xiaocheng,Florinski, Vladimir,Wang, Chi,et al. Effects of Anomalous Cosmic Rays on the Structure of the Outer Heliosphere[J]. ASTROPHYSICAL JOURNAL,2018,859(2):157.
APA Guo, Xiaocheng,Florinski, Vladimir,Wang, Chi,Guo, XC ,&Guo, XC .(2018).Effects of Anomalous Cosmic Rays on the Structure of the Outer Heliosphere.ASTROPHYSICAL JOURNAL,859(2),157.
MLA Guo, Xiaocheng,et al."Effects of Anomalous Cosmic Rays on the Structure of the Outer Heliosphere".ASTROPHYSICAL JOURNAL 859.2(2018):157.
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