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Solar Wind Charge-Exchange X-ray Emissions from the O5+ Ions in the Earth's Magnetosheath
被引:0
|作者:
Zhang, Zhicheng
[1
]
He, Fei
[2
,3
]
Zhang, Xiao-Xin
[4
]
Liang, Guiyun
[5
]
Wang, Xueyi
[6
]
Wei, Yong
[2
,3
]
机构:
[1] China West Normal Univ, Sch Phys & Astron, Nanchong 637009, Peoples R China
[2] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
[3] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
[4] China Meteorol Adm, Natl Ctr Space Weather, Beijing 100081, Peoples R China
[5] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
[6] Auburn Univ, Phys Dept, Auburn, AL 36849 USA
基金:
国家重点研发计划;
关键词:
solar wind charge exchange (SWCX);
earth magnetosheath;
X-ray spectrum;
interplanetary shock;
bow shock;
magnetopause;
ASTROPHYSICS;
D O I:
10.3390/rs16091480
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
The spectra and global distributions of the X-ray emissions generated by the solar wind charge-exchange (SWCX) process in the terrestrial magnetosheath are investigated based on a global hybrid model and a global geocoronal hydrogen model. Solar wind O6+ ions, which are the primary charge state for oxygen ions in solar wind, are considered. The line emissivity of the charge-exchange-borne O5+ ions is calculated by the Spectral Analysis System for Astrophysical and Laboratory (SASAL). It is found that the emission lines from O5+ range from 105.607 to 118.291 eV with a strong line at 107.047 eV. We then simulate the magnetosheath X-ray emission intensity distributions with a virtual camera at two positions of the north pole and dusk at six stages during the passing of a perpendicular interplanetary shock combined with a tangential discontinuity structure through the Earth's magnetosphere. During this process, the X-ray emission intensity increases with time, and the maximum value is 27.11 keV cm(-2) s(-1) sr(-1) on the dayside, which is 4.5 times that before the solar wind structure reached the Earth. A clear shock structure can be seen in the magnetosheath and moves earthward. The maximum emission intensity seen at dusk is always higher than that seen at the north pole.
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