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Modulation of galactic cosmic rays during the unusual solar minimum between cycles 23 and 24
Zhao, L. -L.; Qin, G.; Zhang, M.; Heber, B.; Qin, G (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2014
Volume119Issue:3Pages:1493-1506
ISSN2169-9380
Language英语
AbstractDuring the recent solar minimum between cycles 23 and 24 (solar minimum P-23/24), the intensity of galactic cosmic rays (GCR) measured at the Earth was the highest ever recorded since space age. It is the purpose of this paper to resolve the most plausible mechanism for this unusually high intensity. A GCR transport model in three-dimensional heliosphere based on a simulation of Markov stochastic process is used to find the relation of cosmic ray modulation to various transport parameters, including solar wind (SW) speed, distance of heliospheric boundary, magnitude of interplanetary magnetic field (IMF) at the Earth, tilt angle of heliospheric current sheet, and values of parallel and perpendicular diffusion coefficients. We calculate GCR proton energy spectra at the Earth for the last three solar minima P-21/22, P-22/23, and P-23/24, with the transport parameters obtained from observations. Besides weak IMF magnitude and slow SW speed, we find that a possible low magnetic turbulence, which increases the parallel diffusion and reduces the perpendicular diffusion in the polar direction, might be an additional possible mechanism for the high GCR intensity in the solar minimum P-23/24.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/2760
Collection空间科学部
Corresponding AuthorQin, G (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zhao, L. -L.,Qin, G.,Zhang, M.,et al. Modulation of galactic cosmic rays during the unusual solar minimum between cycles 23 and 24[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2014,119(3):1493-1506.
APA Zhao, L. -L.,Qin, G.,Zhang, M.,Heber, B.,&Qin, G .(2014).Modulation of galactic cosmic rays during the unusual solar minimum between cycles 23 and 24.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,119(3),1493-1506.
MLA Zhao, L. -L.,et al."Modulation of galactic cosmic rays during the unusual solar minimum between cycles 23 and 24".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 119.3(2014):1493-1506.
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