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Global structure and dynamics of large-scale fluctuations in the solar wind: Voyager 2 observations during 2005 and 2006
Burlaga, L. F.; Ness, N. F.; Acuna, M. H.; Wang, Y. M.; Sheeley, N. R.; Wang C(王赤); Richardson, J. D.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research-Space Physics
2008
Volume113Issue:A2Pages:A02104
ISSN0148-0227
Language英语
KeywordMerged Interaction Region Heliospheric Magnetic-field Outer Heliosphere Pickup Ions Interplanetary Shocks Termination Shock Cosmic-rays 95 Au Speed Evolution
AbstractThe Voyager 2 (V2) observations of daily averages of the solar wind during 2005 and 2006 from 75.3 AU to 81.6 AU between approximate to 25.7 degrees S and 27.1 degrees S show both a step-like trend in the speed V(t) and "large-scale fluctuations'' of the magnetic field strength B, speed V, density N and temperature T. The distribution functions of B, N, and NV2 observed by V2 are lognormal and that of V is approximately Gaussian. We introduce a method for specifying the boundary conditions at all latitudes (except near the poles) on a Sun-centered surface of radius of 1 AU, based on solar magnetic field observations. This paper uses only the boundary conditions at the latitude of V2 and a 1-D time-dependent MHD model to calculate the radial evolution of the large-scale fluctuations of B(t), V(t) and N(t) at distances between 1 and 90 AU. This model explains the V2 observations of a lognormal distribution of B and the Gaussian distribution of V, but not the observed lognormal distributions of N and NV2. The lognormal distribution of B observed by V2 was produced primarily by dynamical processes beyond 1 AU.
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/122/1098
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Burlaga, L. F.,Ness, N. F.,Acuna, M. H.,et al. Global structure and dynamics of large-scale fluctuations in the solar wind: Voyager 2 observations during 2005 and 2006[J]. Journal of Geophysical Research-Space Physics,2008,113(A2):A02104.
APA Burlaga, L. F..,Ness, N. F..,Acuna, M. H..,Wang, Y. M..,Sheeley, N. R..,...&北京8701信箱.(2008).Global structure and dynamics of large-scale fluctuations in the solar wind: Voyager 2 observations during 2005 and 2006.Journal of Geophysical Research-Space Physics,113(A2),A02104.
MLA Burlaga, L. F.,et al."Global structure and dynamics of large-scale fluctuations in the solar wind: Voyager 2 observations during 2005 and 2006".Journal of Geophysical Research-Space Physics 113.A2(2008):A02104.
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