DOI: 10.1002/2017JA024379
Scopus记录号: 2-s2.0-85040228831
论文题名: On the Relation Between Soft Electron Precipitations in the Cusp Region and Solar Wind Coupling Functions
作者: Dang T. ; Zhang B. ; Wiltberge M. ; Wang W. ; Varney R. ; Dou X. ; Wan W. ; Lei J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 211
结束页码: 226
语种: 英语
英文关键词: global simulation
; polar cusp
; soft electron precipitation
; solar wind driving
英文摘要: In this study, the correlations between the fluxes of precipitating soft electrons in the cusp region and solar wind coupling functions are investigated utilizing the Lyon-Fedder-Mobarry global magnetosphere model simulations. We conduct two simulation runs during periods from 20 March 2008 to 16 April 2008 and from 15 to 24 December 2014, which are referred as “Equinox Case” and “Solstice Case,” respectively. The simulation results of Equinox Case show that the plasma number density in the high-latitude cusp region scales well with the solar wind number density (ncusp/nsw=0.78), which agrees well with the statistical results from the Polar spacecraft measurements. For the Solstice Case, the plasma number density of high-latitude cusp in both hemispheres increases approximately linearly with upstream solar wind number density with prominent hemispheric asymmetry. Due to the dipole tilt effect, the average number density ratio ncusp/nsw in the Southern (summer) Hemisphere is nearly 3 times that in the Northern (winter) Hemisphere. In addition to the solar wind number density, 20 solar wind coupling functions are tested for the linear correlation with the fluxes of precipitating cusp soft electrons. The statistical results indicate that the solar wind dynamic pressure p exhibits the highest linear correlation with the cusp electron fluxes for both equinox and solstice conditions, with correlation coefficients greater than 0.75. The linear regression relations for equinox and solstice cases may provide an empirical calculation for the fluxes of cusp soft electron precipitation based on the upstream solar wind driving conditions. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114836
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States; Center for Geospace Studies, SRI International, Menlo Park, CA, United States; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Dang T.,Zhang B.,Wiltberge M.,et al. On the Relation Between Soft Electron Precipitations in the Cusp Region and Solar Wind Coupling Functions[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)