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A Study of Electron Forbush Decreases with a 3D SDE Numerical Model
Luo, Xi; Potgieter, Marius S.; Zhang, Ming; Feng, Xueshang; Luo, X (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, SIGMA Weather Grp, Beijing 100190, Peoples R China.; Luo, X (reprint author), North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume860Issue:2Pages:160
ISSN0004-637X
Language英语
KeywordCosmic Rays Sun: Activity Sun: Heliosphere
AbstractBecause of the precise measurements of the cosmic ray electron flux by the PAMELA and AMS02, Electron Forbush decreases (Fds) have recently been observed for the first time. This serves as motivation to perform a numerical study of electron Forbush decreases with an advanced time-dependent, three-dimensional (3D) stochastic differential equation model, developed earlier to study proton Fds. The model includes a realistic interstellar electron spectrum reconstructed from Voyager observations, and diffusion and drift coefficients to reproduce the modulated spectrum observed by PAMELA in 2009. On the basis of this numerical model, electron Fd profiles for a range of rigidities are simulated. In addition, a systematic comparison between electron and proton Fds during different solar polarity epochs is performed. This approach gives insight into the rigidity dependence of the heliospheric diffusion coefficients and of drift effects over two magnetic field polarity cycles. We find that during an A > 0 epoch, the recovery time of a 1 GV proton Fd is remarkably shorter than the 1 GV electrons, whereas the electron Fd display a faster recovery during an A < 0 epoch. This model clear predicts a charge-sign dependent effect in the recovery time of Fds but less so for their magnitude.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6357
Collection空间科学部
Corresponding AuthorLuo, X (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, SIGMA Weather Grp, Beijing 100190, Peoples R China.; Luo, X (reprint author), North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.
Recommended Citation
GB/T 7714
Luo, Xi,Potgieter, Marius S.,Zhang, Ming,et al. A Study of Electron Forbush Decreases with a 3D SDE Numerical Model[J]. ASTROPHYSICAL JOURNAL,2018,860(2):160.
APA Luo, Xi,Potgieter, Marius S.,Zhang, Ming,Feng, Xueshang,Luo, X ,&Luo, X .(2018).A Study of Electron Forbush Decreases with a 3D SDE Numerical Model.ASTROPHYSICAL JOURNAL,860(2),160.
MLA Luo, Xi,et al."A Study of Electron Forbush Decreases with a 3D SDE Numerical Model".ASTROPHYSICAL JOURNAL 860.2(2018):160.
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